<div>Thanks to Dark Shikari and Alex.</div>
<div> </div>
<div>To Dark:</div>
<div> Yes, my Linux kernel is 2.6.18, Is it right that 2.6.18 only have 15 threads at peak?</div>
<div> </div>
<div>To Alex:</div>
<div> 1.How can I check the stats of iowait or disk throughput?</div>
<div> 2. I test the read speed of my hard disk, It shows 7206.39 MB/sec for cached read while 70.35 MB/sec for non-cached, based on non-cached, only 70.35*1024*1024/(720*576*1.5) = 118fps can be achieved, however, as "ultrafast" can achieve 800+ fps, I think the cache is more or less helpful, how can I calculate the peak hard-disk speed ?</div>
<div> <br><br></div>
<div class="gmail_quote">2010/4/7 Jason Garrett-Glaser <span dir="ltr"><<a href="mailto:darkshikari@gmail.com">darkshikari@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div class="im">On Tue, Apr 6, 2010 at 9:05 PM, kenter <<a href="mailto:kenter83@gmail.com">kenter83@gmail.com</a>> wrote:<br>> Thanks for all your help. I've tried your commandline, the result shows for<br>
> --preset slow, CPU ultilize only 700+ and fps is 70.46. The CPU power is<br>> still largely wasted.<br><br></div>x264 does not scale well beyond one thread per ~40 vertical pixels of the frame.<br><br>Additionally, are you using a Linux kernel of 2.6.31 or earlier?<br>
There was a serious bug in the scheduler that massively crippled<br>performance.<br><br>Dark Shikari<br>
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