.TH "MONGOPERF" "1" "March 14, 2013" "2.2.3" "mongodb-manual"
.SH NAME
mongoperf \- MongoDB
.
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.SH SYNOPSIS
.sp
\fI\%mongoperf\fP is a utility to check disk I/O performance
independently of MongoDB.
.sp
It times tests of random disk I/O and presents the results. You can
use \fI\%mongoperf\fP for any case apart from MongoDB. The
\fI\%mmf\fP \fBtrue\fP mode is completely generic. In
that mode is it somewhat analogous to tools such as \fI\%bonnie++\fP (albeit mongoperf is
simpler).
.sp
Specify options to \fI\%mongoperf\fP using a JavaScript document.
.IP "See also"
.INDENT 0.0
.IP \(bu 2
\fI\%bonnie\fP
.IP \(bu 2
\fI\%bonnie++\fP
.IP \(bu 2
\fI\%Output from an example run\fP
.IP \(bu 2
\fI\%Checking Disk Performance with the mongoperf Utility\fP
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.RE
.SH OPTIONS
.INDENT 0.0
.TP
.B mongoperf
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.TP
.B \-\-help
Displays the options to \fI\%mongoperf\fP.  Specify options to
\fI\%mongoperf\fP with a JSON document described in the
\fI\%Configuration Fields\fP section.
.UNINDENT
.INDENT 0.0
.TP
.B <jsonconfig>
\fI\%mongoperf\fP accepts configuration options in the form of a
file that holds a \fIJSON\fP document. You must stream the
content of this file into \fI\%mongoperf\fP, as in the following
operation:
.sp
.nf
.ft C
mongoperf < config
.ft P
.fi
.sp
In this example \fBconfig\fP is the name of a file that holds a JSON
document that resembles the following example:
.sp
.nf
.ft C
{
  nThreads:<n>,
  fileSizeMB:<n>,
  sleepMicros:<n>,
  mmf:<bool>,
  r:<bool>,
  w:<bool>,
  recSizeKB:<n>,
  syncDelay:<n>
}
.ft P
.fi
.sp
See the \fI\%Configuration Fields\fP section for documentation of each
of these fields.
.UNINDENT
.SH CONFIGURATION FIELDS
.INDENT 0.0
.TP
.B mongoperf.nThreads
\fIType:\fP Integer.
.sp
\fIDefault:\fP 1
.sp
Defines the number of threads \fI\%mongoperf\fP will use in the
test. To saturate your system\(aqs storage system you will need
multiple threads. Consider setting \fI\%nThreads\fP to \fB16\fP.
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.INDENT 0.0
.TP
.B mongoperf.fileSizeMB
\fIType:\fP Integer.
.sp
\fIDefault:\fP 1 megabyte (i.e. 1024\s-2\u2\d\s0 bytes)
.sp
Test file size.
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.TP
.B mongoperf.sleepMicros
\fIType:\fP Integer.
.sp
\fIDefault:\fP 0
.sp
\fI\%mongoperf\fP will pause for the number of specified
\fI\%sleepMicros\fP divided by the
\fI\%nThreads\fP between each operation.
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.TP
.B mongoperf.mmf
\fIType:\fP Boolean.
.sp
\fIDefault:\fP \fBfalse\fP
.sp
Set \fI\%mmf\fP to \fBtrue\fP to use memory mapped
files for the tests.
.sp
Generally:
.INDENT 7.0
.IP \(bu 2
when \fI\%mmf\fP is \fBfalse\fP, \fI\%mongoperf\fP
tests direct, physical, I/O, without caching. Use a large file
size to test heavy random I/O load and to avoid I/O coalescing.
.IP \(bu 2
when \fI\%mmf\fP is \fBtrue\fP, \fI\%mongoperf\fP
runs tests of the caching system, and can use normal file system
cache. Use \fBmmf\fP in this mode to test file system cache
behavior with memory mapped files.
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.TP
.B mongoperf.r
\fIType:\fP Boolean.
.sp
\fIDefault:\fP \fBfalse\fP
.sp
Set \fI\%r\fP to \fBtrue\fP to perform reads as part of
the tests.
.sp
Either \fI\%r\fP or \fI\%w\fP must be \fBtrue\fP.
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.INDENT 0.0
.TP
.B mongoperf.w
\fIType:\fP Boolean.
.sp
\fIDefault:\fP \fBfalse\fP
.sp
Set \fI\%w\fP to \fBtrue\fP to perform writes as part of
the tests.
.sp
Either \fI\%r\fP or \fI\%w\fP must be \fBtrue\fP.
.UNINDENT
.INDENT 0.0
.TP
.B mongoperf.syncDelay
\fIType:\fP Integer.
.sp
\fIDefault:\fP 0
.sp
Seconds between disk flushes. \fI\%syncDelay\fP is
similar to \fBsyncDelay\fP for \fBmongod\fP.
.sp
The \fI\%syncDelay\fP controls how frequently
\fI\%mongoperf\fP performs an asynchronous disk flush the memory
mapped file used for testing. By default, \fBmongod\fP
performs this operation every every 60 seconds. Use
\fI\%syncDelay\fP to test basic system performance of
this type of operation.
.sp
Only use \fI\%syncDelay\fP in conjunction with
\fI\%mmf\fP set to \fBtrue\fP.
.sp
The default value of \fB0\fP disables this
.UNINDENT
.SH USE
.sp
.nf
.ft C
mongoperf < jsonconfigfile
.ft P
.fi
.sp
Replace \fBjsonconfigfile\fP with the path to the \fI\%mongoperf\fP
configuration. You may also invoke \fI\%mongoperf\fP in the
following form:
.sp
.nf
.ft C
echo "{nThreads:16,fileSizeMB:1000,r:true}" | ./mongoperf
.ft P
.fi
.sp
In this operation:
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.IP \(bu 2
\fI\%mongoperf\fP tests direct physical random read io\(aqs, using
16 concurrent reader threads.
.IP \(bu 2
\fI\%mongoperf\fP  uses a 1 gigabyte test file.
.UNINDENT
.sp
Consider using \fBiostat\fP, as invoked in the following example to
monitor I/O performance during the test.
.sp
.nf
.ft C
iostat \-xm 2
.ft P
.fi
.SH AUTHOR
MongoDB Documentation Project
.SH COPYRIGHT
2011-2013, 10gen, Inc.
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