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<title>gfperf-write</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" title="gfperf-write">
<a name="gfperf-write.1"></a><div class="titlepage"></div>
<div class="refnamediv">
<a name="name"></a><h2>Name</h2>
<p>gfperf-write — Gfarm measure file write performance</p>
</div>
<div class="refsynopsisdiv" title="Synopsis">
<a name="synopsis"></a><h2>Synopsis</h2>
<div class="cmdsynopsis"><p><code class="command">gfperf-write</code> [-t, --testdir <em class="replaceable"><code>test directory</code></em>] [-m, --gfarm2fs <em class="replaceable"><code>gfarm2fs mount point</code></em>] [-l, --filesize <em class="replaceable"><code>file size</code></em>] [-b, --bufsize <em class="replaceable"><code>buffer size</code></em>] [-r, --random <em class="replaceable"><code>random</code></em>] [-g, --gfsd <em class="replaceable"><code>gfsd name</code></em>] [-o, --overwrite <em class="replaceable"><code>overwrite flag</code></em>] [-k, --timeout <em class="replaceable"><code>timeout seconds</code></em>]</p></div>
</div>
<div class="refsect1" title="DESCRIPTION">
<a name="description"></a><h2>DESCRIPTION</h2>
<p>This command mesures file write performance of specified size of file in <em class="parameter"><code>test directory</code></em>.
The test file is automatically created and removed.
If overwrite flag is on, test file is not removed to be reused again.
</p>
</div>
<div class="refsect1" title="OPTIONS">
<a name="options"></a><h2>OPTIONS</h2>
<div class="variablelist"><dl>
<dt><span class="term"><code class="option">-t, --testdir</code> <em class="parameter"><code>test directory</code></em></span></dt>
<dd><p>
Test file is created in <em class="parameter"><code>test directory</code></em>.
Specify only gfarm url (that begins with gfarm:///) .
The default is gfarm:///tmp .
</p></dd>
<dt><span class="term"><code class="option">-m, --gfarm2fs</code> <em class="parameter"><code>gfarm2fs mount point</code></em></span></dt>
<dd><p>
Specify gfarm2fs mount point.
</p></dd>
<dt><span class="term"><code class="option">-l, --filesize</code> <em class="parameter"><code>file size</code></em></span></dt>
<dd><p>
File size to be created.
The default is 1M. (1G=2^20)
</p></dd>
<dt><span class="term"><code class="option">-b, --bufsize</code> <em class="parameter"><code>buffer size</code></em></span></dt>
<dd><p>
Buffer size to write test file.
The default is 4K. (1K=2^10)
</p></dd>
<dt><span class="term"><code class="option">-r, --random</code> <em class="parameter"><code>random</code></em></span></dt>
<dd><p>
Only if this option is specified, Writes test file randomly.
Option parameter is free.
If this option is omitted, this command writes test file sequentially.
</p></dd>
<dt><span class="term"><code class="option">-g, --gfsd</code> <em class="parameter"><code>gfsd name</code></em></span></dt>
<dd><p>
Specify gfsd name on which test file is created.
If this option is omitted, gfmd determines automatically.
</p></dd>
<dt><span class="term"><code class="option">-o, --overwrite</code> <em class="parameter"><code>overwrite flag</code></em></span></dt>
<dd><p>
Only if this option is specified, Overwrite test file.
Option parameter is free.
If this option is omitted, this command appends test data on 1 byte file.
</p></dd>
<dt><span class="term"><code class="option">-k, --timeout</code> <em class="parameter"><code>timeout seconds</code></em></span></dt>
<dd><p>
Maximum write time in seconds.
This comannd measures how much data to be written in this seconds.
</p></dd>
</dl></div>
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