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7b232e9354
The meaning of the `free` field is currently `zfs_arc_sys_free`, which
is the target amount of memory to leave free for the system, and is
constant after booting.
This commit changes the meaning of `free` to arc_free_memory(), the
amount of memory that the ARC considers to be free.
It also adds a new arcstat field `avail`, which tracks
`arc_available_memory()`.
Since `avail` can be negative, it also updates the arcstat script to
pretty-print negative values.
example output:
$ arcstat -f time,miss,arcsz,c,grow,need,free,avail 1
time miss arcsz c grow need free avail
15:03:02 39K 114G 114G 0 0 2.4G 407M
15:03:03 42K 114G 114G 0 0 2.1G 120M
15:03:04 40K 114G 114G 0 0 1.8G -177M
15:03:05 24K 113G 112G 0 0 1.7G -269M
15:03:06 29K 111G 110G 0 0 1.6G -385M
15:03:07 27K 110G 108G 0 0 1.4G -535M
15:03:08 13K 108G 108G 0 0 2.2G 239M
15:03:09 33K 107G 107G 0 0 1.3G -639M
15:03:10 16K 105G 102G 0 0 2.6G 704M
15:03:11 7.2K 102G 102G 0 0 5.1G 3.1G
15:03:12 42K 103G 102G 0 0 4.8G 2.8G
Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Signed-off-by: Matthew Ahrens <mahrens@delphix.com>
Closes #10494
503 lines
5.3 KiB
Groff
503 lines
5.3 KiB
Groff
.\"
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.\" This file and its contents are supplied under the terms of the
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.\" Common Development and Distribution License ("CDDL"), version 1.0.
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.\" You may only use this file in accordance with the terms of version
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.\" 1.0 of the CDDL.
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.\"
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.\" A full copy of the text of the CDDL should have accompanied this
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.\" source. A copy of the CDDL is also available via the Internet at
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.\" http://www.illumos.org/license/CDDL.
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.\"
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.\"
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.\" Copyright 2014 Adam Stevko. All rights reserved.
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.\" Copyright (c) 2015 by Delphix. All rights reserved.
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.\" Copyright (c) 2020 by AJ Jordan. All rights reserved.
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.\"
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.TH ARCSTAT 1 "May 7, 2020"
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.SH NAME
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arcstat \- report ZFS ARC and L2ARC statistics
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.SH SYNOPSIS
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.LP
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.nf
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\fBarcstat\fR [\fB-hvx\fR] [\fB-f field[,field]...\fR] [\fB-o file\fR] [\fB-s string\fR] [\fBinterval\fR [\fBcount\fR]]
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.fi
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.SH DESCRIPTION
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.LP
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The \fBarcstat\fR utility print various ZFS ARC and L2ARC statistics in
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vmstat-like fashion.
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.sp
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.sp
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.LP
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The \fBarcstat\fR command reports the following information:
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.sp
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.ne 2
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.\"
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.sp
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.ne 1
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.na
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\fBc \fR
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.ad
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.RS 14n
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ARC target size
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.RE
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.sp
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.ne 2
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.na
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\fBdh% \fR
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.ad
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.RS 14n
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Demand data hit percentage
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.RE
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.sp
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.ne 2
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.na
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\fBdm% \fR
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.ad
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.RS 14n
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Demand data miss percentage
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.RE
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.sp
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.ne 2
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.na
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\fBmfu \fR
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.ad
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.RS 14n
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MFU list hits per second
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.RE
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.sp
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.ne 2
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.na
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\fBmh% \fR
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.ad
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.RS 14n
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Metadata hit percentage
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.RE
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.sp
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.ne 2
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.na
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\fBmm% \fR
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.ad
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.RS 14n
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Metadata miss percentage
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.RE
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.sp
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.ne 2
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.na
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\fBmru \fR
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.ad
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.RS 14n
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MRU list hits per second
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.RE
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.sp
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.ne 2
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.na
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\fBph% \fR
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.ad
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.RS 14n
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Prefetch hits percentage
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.RE
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.sp
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.ne 2
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.na
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\fBpm% \fR
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.ad
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.RS 14n
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Prefetch miss percentage
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.RE
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.sp
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.ne 2
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.na
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\fBdhit \fR
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.ad
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.RS 14n
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Demand data hits per second
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.RE
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.sp
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.ne 2
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.na
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\fBdmis \fR
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.ad
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.RS 14n
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Demand data misses per second
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.RE
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.sp
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.ne 2
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.na
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\fBhit% \fR
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.ad
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.RS 14n
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ARC hit percentage
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.RE
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.sp
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.ne 2
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.na
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\fBhits \fR
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.ad
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.RS 14n
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ARC reads per second
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.RE
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.sp
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.ne 2
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.na
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\fBmfug \fR
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.ad
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.RS 14n
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MFU ghost list hits per second
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.RE
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.sp
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.ne 2
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.na
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\fBmhit \fR
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.ad
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.RS 14n
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Metadata hits per second
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.RE
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.sp
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.ne 2
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.na
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\fBmiss \fR
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.ad
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.RS 14n
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ARC misses per second
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.RE
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.sp
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.ne 2
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.na
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\fBmmis \fR
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.ad
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.RS 14n
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Metadata misses per second
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.RE
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.sp
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.ne 2
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.na
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\fBmrug \fR
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.ad
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.RS 14n
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MRU ghost list hits per second
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.RE
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.sp
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.ne 2
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.na
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\fBphit \fR
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.ad
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.RS 14n
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Prefetch hits per second
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.RE
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.sp
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.ne 2
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.na
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\fBpmis \fR
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.ad
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.RS 14n
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Prefetch misses per second
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.RE
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.sp
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.ne 2
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.na
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\fBread \fR
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.ad
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.RS 14n
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Total ARC accesses per second
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.RE
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.sp
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.ne 2
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.na
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\fBtime \fR
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.ad
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.RS 14n
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Time
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.RE
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.sp
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.ne 2
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.na
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\fBsize \fR
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.ad
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.RS 14n
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ARC size
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.RE
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.sp
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.ne 2
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.na
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\fBarcsz \fR
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.ad
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.RS 14n
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Alias for \fBsize\fR
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.RE
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.sp
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.ne 2
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.na
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\fBdread \fR
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.ad
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.RS 14n
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Demand data accesses per second
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.RE
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.sp
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.ne 2
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.na
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\fBeskip \fR
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.ad
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.RS 14n
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evict_skip per second
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.RE
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.sp
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.ne 2
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.na
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\fBmiss% \fR
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.ad
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.RS 14n
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ARC miss percentage
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.RE
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.sp
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.ne 2
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.na
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\fBmread \fR
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.ad
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.RS 14n
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Metadata accesses per second
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.RE
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.sp
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.ne 2
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.na
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\fBpread \fR
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.ad
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.RS 14n
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Prefetch accesses per second
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.RE
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.sp
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.ne 2
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.na
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\fBl2hit% \fR
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.ad
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.RS 14n
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L2ARC access hit percentage
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.RE
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.sp
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.ne 2
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.na
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\fBl2hits \fR
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.ad
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.RS 14n
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L2ARC hits per second
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.RE
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.sp
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.ne 2
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.na
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\fBl2miss \fR
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.ad
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.RS 14n
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L2ARC misses per second
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.RE
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.sp
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.ne 2
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.na
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\fBl2read \fR
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.ad
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.RS 14n
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Total L2ARC accesses per second
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.RE
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.sp
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.ne 2
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.na
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\fBl2size \fR
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.ad
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.RS 14n
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Size of the L2ARC
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.RE
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.sp
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.ne 2
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.na
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\fBmtxmis \fR
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.ad
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.RS 14n
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mutex_miss per second
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.RE
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.sp
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.ne 2
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.na
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\fBl2bytes \fR
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.ad
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.RS 14n
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Bytes read per second from the L2ARC
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.RE
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.sp
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.ne 2
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.na
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\fBl2miss% \fR
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.ad
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.RS 14n
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L2ARC access miss percentage
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.RE
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.sp
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.ne 2
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.na
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\fBl2asize \fR
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.ad
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.RS 14n
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Actual (compressed) size of the L2ARC
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.RE
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.sp
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.ne 2
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.na
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\fBgrow \fR
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.ad
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.RS 14n
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ARC grow disabled
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.RE
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.sp
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.ne 2
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.na
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\fBneed \fR
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.ad
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.RS 14n
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ARC reclaim needed
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.RE
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.sp
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.ne 2
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.na
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\fBfree \fR
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.ad
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.RS 14n
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The ARC's idea of how much free memory there is, which includes evictable memory in the page cache.
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Since the ARC tries to keep \fBavail\fR above zero, \fBavail\fR is usually more instructive to observe than \fBfree\fR.
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.RE
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.sp
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.ne 2
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.na
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\fBavail \fR
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.ad
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.RS 14n
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The ARC's idea of how much free memory is available to it, which is a bit less than \fBfree\fR.
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May temporarily be negative, in which case the ARC will reduce the target size \fBc\fR.
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.RE
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.\"
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.SH OPTIONS
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.LP
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The following options are supported:
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.sp
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.ne 2
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.na
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\fB\fB-f\fR\fR
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.ad
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.RS 12n
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Display only specific fields. See \fBDESCRIPTION\fR for supported statistics.
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.RE
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.sp
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.ne 2
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.na
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\fB\fB-h\fR\fR
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.ad
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.RS 12n
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Display help message.
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.RE
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.sp
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.ne 2
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.na
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\fB\fB-o\fR\fR
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.ad
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.RS 12n
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Report statistics to a file instead of the standard output.
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.RE
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.sp
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.ne 2
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.na
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\fB\fB-s\fR\fR
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.ad
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.RS 12n
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Display data with a specified separator (default: 2 spaces).
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.RE
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.sp
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.ne 2
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.na
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\fB\fB-x\fR\fR
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.ad
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.RS 12n
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Print extended stats (same as -f time,mfu,mru,mfug,mrug,eskip,mtxmis,dread,pread,read).
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.RE
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.sp
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.ne 2
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.na
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\fB\fB-v\fR\fR
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.ad
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.RS 12n
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Show field headers and definitions
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.RE
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.SH OPERANDS
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.LP
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The following operands are supported:
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.sp
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.ne 2
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.na
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\fB\fIcount\fR\fR
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.ad
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.RS 12n
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Display only \fIcount\fR reports.
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.RE
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.sp
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.ne 2
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.na
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\fB\fIinterval\fR\fR
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.ad
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.RS 12n
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Specify the sampling interval in seconds.
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.RE
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.SH AUTHORS
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.LP
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arcstat was originally written in Perl by Neelakanth Nadgir and supported only ZFS ARC statistics.
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Mike Harsch updated it to support L2ARC statistics.
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John Hixson ported it to Python for FreeNAS over some beer, after which many individuals from the OpenZFS community continued to maintain and improve it.
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