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<h1 align="center" style="text-align: left;">Overview</h1>
<p class="MsoNormal"> The Lustre filesystem added the ability to track I/O performance of a job across a cluster. The initial algorithm was relatively simplistic: for every I/O, look up the job ID of the process and include it in the RPC being
sent to the server. This imposed a non-trivial performance impact on client I/O performance.<o:p></o:p></p>
<p class="MsoNormal"> An additional algorithm was introduced to handle the single job per node case, where instead of looking up the job ID of the process, Lustre simply accesses the value of a variable set through the proc interface. This improved
performance greatly, but only functions when a single job is being run.<o:p></o:p></p>
<p class="MsoNormal"> A new approach is needed for multiple job per node systems.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<h2>Proposed Solution<o:p></o:p></h2>
<p class="MsoNormal"> The proposed solution to this is to create a small PID->JobID table in kernel memory. When a process performs an IO, a lookup is done in the table for the PID, if a JobID exists for that PID, it is used, otherwise it is retrieved
via the same methods as the original Jobstats algorithm. Once located the JobID is stored in a PID/JobID table in memory. The existing cfs_hash_table structure and functions will be used to implement the table.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<h2>Rationale<o:p></o:p></h2>
<p class="MsoNormal"> This reduces the number of calls into userspace, minimizing the time taken on each I/O. It also easily supports multiple job per node scenarios, and like other proposed solutions has no issue with multiple jobs performing I/O
on the same file at the same time.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<h2>Requirements<o:p></o:p></h2>
<p class="MsoListParagraphCxSpFirst" style="margin-left:1.0in;mso-add-space:auto;
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<!--[if !supportLists]--><span style="">·<span style="font-size: 7pt; line-height: normal; font-family: 'Times New Roman';">
</span></span><!--[endif]-->Performance cannot significantly detract from baseline performance without jobstats<o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle" style="margin-left:1.0in;mso-add-space:
auto;text-indent:-.25in;mso-list:l0 level1 lfo1">
<!--[if !supportLists]--><span style="">·<span style="font-size: 7pt; line-height: normal; font-family: 'Times New Roman';">
</span></span><!--[endif]-->Supports multiple jobs per node<o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle" style="margin-left:1.0in;mso-add-space:
auto;text-indent:-.25in;mso-list:l0 level1 lfo1">
<!--[if !supportLists]--><span style="">·<span style="font-size: 7pt; line-height: normal; font-family: 'Times New Roman';">
</span></span><!--[endif]-->Coordination with the scheduler is not required, but interfaces may be provided<o:p></o:p></p>
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text-indent:-.25in;mso-list:l0 level1 lfo1">
<!--[if !supportLists]--><span style="">·<span style="font-size: 7pt; line-height: normal; font-family: 'Times New Roman';">
</span></span><!--[endif]-->Supports multiple PIDs per job<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<h3>New Data Structures<o:p></o:p></h3>
<p class="MsoNormal"> pid_to_jobid {<o:p></o:p></p>
<p class="MsoNormal"> struct hlist_node pj_hash;<o:p></o:p></p>
<p class="MsoNormal"> u54 pj_pid;<o:p></o:p></p>
<p class="MsoNormal"> char pj_jobid[LUSTRE_JOBID_SIZE];<o:p></o:p></p>
<p class="MsoNormal"><span class="Apple-tab-span" style="white-space:pre"></span>spinlock_t jp_lock;</p>
<p class="MsoNormal"> time_t jp_time;<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">}<o:p></o:p></p>
<h3>Proc Variables<o:p></o:p></h3>
<p class="MsoNormal" style="text-indent:.5in">Writing to /proc/fs/lustre/jobid_name while not in “nodelocal” mode will cause all entries in the cache for that jobID to be removed from the cache<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<h2>Populating the Cache<o:p></o:p></h2>
<p class="MsoNormal"> When lustre_get_jobid is called, the process, and in the cached mode, first a check will be done in the cache for a valid PID to JobID mapping. If none exists, it uses the same mechanisms to get the JobID and populates the
appropriate PID to JobID map.</p>
<p class="MsoNormal"><span class="Apple-tab-span" style="white-space:pre"></span>If a lookup is performed and the PID to JobID mapping exists, but is more than 30 seconds old, the JobID is refreshed.</p>
<h3>Purging the Cache<o:p></o:p></h3>
<p class="MsoNormal"> The cache can be purged of a specific job by writing the JobID to the jobid_name proc file. Any items in the cache that are more than 300 seconds out of date will also be purged at this time.<o:p></o:p></p>
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