Date: Tue, 23 Oct 2007 17:55:34 -0400 From: "Josh Carroll" <josh.carroll@gmail.com> To: freebsd-performance@freebsd.org Subject: Re: ULE vs. 4BSD in RELENG_7 Message-ID: <8cb6106e0710231455j1f97c694l5e54578442bde123@mail.gmail.com> In-Reply-To: <8cb6106e0710231257k154e9c6ev4b4ba8c3692206fb@mail.gmail.com> References: <8cb6106e0710230902x4edf2c8eu2d912d5de1f5d4a2@mail.gmail.com> <b1fa29170710231047i50859fa7gde2904985a7a8c20@mail.gmail.com> <8cb6106e0710231257k154e9c6ev4b4ba8c3692206fb@mail.gmail.com>
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> My next step is to run some transcodes with mencoder to see if it has > similar performance between the two schedulers. When I have those > results, I'll post them to this thread. mencoder is linked against the same libx264 library that ffmpeg uses for h.264 encoding, so I was expecting similar results as ffmpeg. However, the results are slightly different: 4BSD (threads=2): 93.82 real 182.82 user 0.30 sys 4BSD (threads=3): 64.79 real 184.27 user 0.41 sys 4BSD (threads=4): 51.36 real 185.76 user 0.31 sys 4BSD (threads=5): 49.88 real 186.11 user 0.24 sys 4BSD (threads=6): 49.53 real 186.28 user 0.32 sys 4BSD (threads=7): 49.45 real 186.32 user 0.33 sys 4BSD (threads=8): 49.36 real 186.39 user 0.34 sys ULE (threads=2): 92.81 real 182.41 user 0.36 sys ULE (threads=3): 64.28 real 184.57 user 0.39 sys ULE (threads=4): 56.83 real 185.83 user 0.32 sys ULE (threads=5): 55.30 real 185.95 user 0.42 sys ULE (threads=6): 55.38 real 186.12 user 0.45 sys ULE (threads=7): 55.24 real 186.14 user 0.60 sys ULE (threads=8): 55.08 real 186.28 user 0.52 sys What's interesting is that for threads=2 and threads=3, ULE and 4BSD are performing the same. After that, though, there's a 10% gap for the remaining data points. Also interesting is that they both reach a plateau at threads=5. I suppose this means mencoder is more efficient than ffmpeg? Anyway, ULE is still 10% slower with mencoder, which is "worse" than the 5% drop with ffmpeg. I decided to run pbzip2 also. The -p argument doesn't seem to necessarily create as many threads as you request (or it's completely I/O bound): 4BSD(-p 4): 30.91 real 117.32 user 4.67 sys 4BSD(-p 5): 31.45 real 119.49 user 5.02 sys 4BSD(-p 6): 31.85 real 120.42 user 5.49 sys 4BSD(-p 7): 31.55 real 119.16 user 5.59 sys 4BSD(-p 8): 31.92 real 120.29 user 5.81 sys ULE(-p 4): 33.73 real 114.60 user 4.51 sys ULE(-p 5): 31.57 real 116.80 user 5.18 sys ULE(-p 6): 31.74 real 118.00 user 5.21 sys ULE(-p 7): 32.04 real 118.32 user 5.39 sys ULE(-p 8): 32.35 real 120.22 user 6.05 sys ULE is slightly slower here with -p4 (9.12 %) and -p8 (1.35 %), but about the same for 5-7. Hope this helps, Josh
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