http://wiki.old.lustre.org/index.php?title=Large-Scale_Tuning_for_Cray_XT&feed=atom&action=historyLarge-Scale Tuning for Cray XT - Revision history2024-03-28T18:41:40ZRevision history for this page on the wikiMediaWiki 1.35.5http://wiki.old.lustre.org/index.php?title=Large-Scale_Tuning_for_Cray_XT&diff=11180&oldid=prevSbarthel at 15:54, 22 February 20102010-02-22T15:54:48Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 15:54, 22 February 2010</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>This section applies to Cray XT3 Catamount nodes and explains parameters used with the ''kptllnd'' module.</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>This section applies to Cray XT3 Catamount nodes and explains parameters used with the ''kptllnd'' module.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>== Network Tunables ==</div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>==<ins class="diffchange diffchange-inline">==<big></ins>Network Tunables<ins class="diffchange diffchange-inline"></big>==</ins>==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>With a large number of clients and servers possible on these systems, tuning various request pools becomes important, requiring changes to the ''ptllnd'' module.</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>With a large number of clients and servers possible on these systems, tuning various request pools becomes important, requiring changes to the ''ptllnd'' module.</div></td></tr>
</table>Sbarthelhttp://wiki.old.lustre.org/index.php?title=Large-Scale_Tuning_for_Cray_XT&diff=11175&oldid=prevSbarthel at 15:44, 22 February 20102010-02-22T15:44:30Z<p></p>
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</table>Sbarthelhttp://wiki.old.lustre.org/index.php?title=Large-Scale_Tuning_for_Cray_XT&diff=11174&oldid=prevSbarthel at 15:41, 22 February 20102010-02-22T15:41:18Z<p></p>
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</table>Sbarthelhttp://wiki.old.lustre.org/index.php?title=Large-Scale_Tuning_for_Cray_XT&diff=10914&oldid=prevDocadmin: Created page with '---- DISCLAIMER - EXTERNAL CONTRIBUTOR CONTENT This content was submitted by an external contributor. We provide this information as a resource for the Lustre™ open-source co...'2010-02-10T02:28:52Z<p>Created page with '---- DISCLAIMER - EXTERNAL CONTRIBUTOR CONTENT This content was submitted by an external contributor. We provide this information as a resource for the Lustre™ open-source co...'</p>
<p><b>New page</b></p><div>----<br />
<br />
DISCLAIMER - EXTERNAL CONTRIBUTOR CONTENT<br />
<br />
This content was submitted by an external contributor. We provide this information as a resource for the Lustre™ open-source community, but we make no representation as to the accuracy, completeness or reliability of this information. <br />
<br />
----<br />
<br />
This section applies to Cray XT3 Catamount nodes and explains parameters used with the ''kptllnd'' module.<br />
<br />
== Network Tunables ==<br />
<br />
With a large number of clients and servers possible on these systems, tuning various request pools becomes important, requiring changes to the ''ptllnd'' module.<br />
{| border="1" cellspacing=0 cellpadding="10"<br />
! Parameter !! Description<br />
|-<br />
| max_nodes<br />
| ''max_nodes'' is the maximum number of queue pairs, and, therefore, the maximum number of peers with which the LND instance can communicate. Set ''max_nodes'' to a value higher than the product of the total number of nodes and maximum processes per node.<br />
<br />
Max nodes > (Total # Nodes) * (max_procs_per_node)<br />
<br />
Setting ''max_nodes'' to a lower value than described causes Lustre to throw an error. Setting ''max_nodes'' to a higher value causes excess memory to be consumed.<br />
|-<br />
|max_procs_per_node<br />
|''max_procs_per_node'' is the maximum number of cores (CPUs), on a single Catamount node. Portals must know this value to properly clean up various queues. LNET is not notified directly when a Catamount process aborts. The first information LNET receives is when a new Catamount process with the same Cray portals NID starts and sends a connection request. If the number of processes with that Cray portals NID exceeds the ''max_procs_per_node'' value, LNET removes the oldest one to make space for the new one.<br />
|}<br />
<br />
These two tunables combine to set the size of the ''ptllnd'' request buffer pool. The buffer pool must never drop an incoming message, so proper sizing is very important.<br />
<br />
{| border="1" cellspacing=0 cellpadding="10"<br />
|-<br />
| Ntx<br />
| <br />
''Ntx'' helps to size the transmit (tx) descriptor pool. A tx descriptor is used for each send and each passive RDMA. The max number of concurrent sends == 'credits'. Passive RDMA is a response to a PUT or GET of a payload that is too big to fit in a small message buffer. For servers, this only happens on large RPCs (for instance, where a long file name is included), so the MDS could be under pressure in a large cluster. For routers, this is bounded by the number of servers. If the tx pool is exhausted, a console error message appears.<br />
|-<br />
|Credits<br />
|Credits determine how many sends are in-flight at once on ''ptllnd''. Optimally, there are 8 requests in-flight per server. The default value is 128, which should be adequate for most applications.<br />
|}</div>Docadmin