<html><head><base href="x-msg://164/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div></div><div><br></div><div><br></div><div>===================</div><div>Let's take a step back to reconsider what's real cause in Nasf's test. I tend to think the load on OSSes might cause that symptom. It's obvious that Async Glimpse Lock produces more stress on OSS, especially in his test env where multiple OSTs are actually on the same OSS. This will make the ls time increased by the stripe count as well - since OSS has to handle more RPCs when the stripe count increases in a specific time. This problem may be mitigated by distributing OSTs to more OSSes.</div><div><br></div><div>Thanks,</div><div>Jinshan</div><br><blockquote type="cite"><div bgcolor="white" lang="EN-GB" link="blue" vlink="purple"><div class="WordSection1" style="page: WordSection1; "><div style="border-top-style: none; border-right-style: none; border-bottom-style: none; border-width: initial; border-color: initial; border-left-style: solid; border-left-color: blue; border-left-width: 1.5pt; padding-top: 0cm; padding-right: 0cm; padding-bottom: 0cm; padding-left: 4pt; position: static; z-index: auto; "><div style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0.0001pt; margin-left: 0cm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><br>2) Patched b2_x is much faster than original b2_x, for traversing 400K * 32-striped directory, it is 100 times or more improved.<br><br>3) Patched b2_x is also faster than b1_8, within our test, patched b2_x is at least 4X faster than b1_8, which matches the requirement in ORNL contract.<br><br>4) Original b2_x is faster than b1_8 only for small striped cases, not more than 4-striped. For large striped cases, slower than b1_8, which is consistent with ORNL test result.<br><br>5) The largest stripe count is 32 in our test. We have not enough resource to test more large striped cases. And I also wonder whether it is worth to test more large striped directory or not. Because how many customers want to use large and full striped directory? means contains 1M * 160-striped items in signal directory. If it is rare case, then wasting lots of time on that is worthless.<br><br>We need to confirm with ORNL what is the last acceptance test cases and environment, includes:<br>a) stripe count<br>b) item count<br>c) network latency, w/o lnet router, suggest without router.<br>d) OST count on each OSS<br><br><br>Cheers,<br>--<br>Nasf<o:p></o:p></div></div></div><span><result_20110512.xls></span>_______________________________________________<br>Lustre-devel mailing list<br><a href="mailto:Lustre-devel@lists.lustre.org" style="color: blue; text-decoration: underline; ">Lustre-devel@lists.lustre.org</a><br><a href="http://lists.lustre.org/mailman/listinfo/lustre-devel" style="color: blue; text-decoration: underline; ">http://lists.lustre.org/mailman/listinfo/lustre-devel</a><br></div></blockquote></div><br></body></html>