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 Post subject: Throughput variations.
PostPosted: Mon Sep 01, 2008 5:27 pm 
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Joined: Fri Jan 12, 2007 4:27 am
Posts: 577
Location: Scotland
I "robbed" 2GB of RAM out of my server to use in my in-build HTPC and thought nothing of it.

However, tonight I transferred some large files to my server (26.7GB) and the server seems to enjoy higher write speeds with 2GB installed than with 4GB installed....

I'm confused, so as a follow up I will run some more tests tomorrow. Preliminary tests: (almost always fails to initiate the read element of the diskwriggler test)
Code:
C:\Documents and Settings\User>dw u: 4096
Frame Resolution  : 720 x 576
Bytes / Pixel     : 2.00 (packed) (8 bit, 4:2:2 sampling)
Frame Size        : 829,440 bytes
File Type         : All frames in one container file (3,397,386,240 bytes).

Writing 4096 x 829440 byte frames into file u:/framestream.dat
554 frames in 5.00 secs ==> 110.80 FPS (87.64 MB/s)
107 frames in 5.00 secs ==> 21.40 FPS (16.93 MB/s)
367 frames in 7.42 secs ==> 49.45 FPS (39.11 MB/s)
515 frames in 5.11 secs ==> 100.79 FPS (79.73 MB/s)
300 frames in 5.00 secs ==> 60.00 FPS (47.46 MB/s)
324 frames in 5.00 secs ==> 64.80 FPS (51.26 MB/s)
194 frames in 5.00 secs ==> 38.80 FPS (30.69 MB/s)
236 frames in 6.03 secs ==> 39.13 FPS (30.95 MB/s)
155 frames in 5.09 secs ==> 30.43 FPS (24.07 MB/s)
404 frames in 11.58 secs ==> 34.89 FPS (27.60 MB/s)
560 frames in 5.00 secs ==> 112.00 FPS (88.59 MB/s)
 12 frames in 5.22 secs ==> 2.30 FPS (1.82 MB/s)
368 frames in 3.50 secs ==> 105.14 FPS (83.17 MB/s)

Write Summary : 4096.00 frames in 73.95 secs
              :    2.30(min)   55.39(avg)  112.00(max) FPS
              :    1.82(min)   43.81(avg)   88.59(max) MB/s

Reading 4096 x 829440 byte frames from file u:/framestream.dat
read_frames:read_frames: CreateFile failed: 32.

C:\Documents and Settings\User>dw u: 4096
Frame Resolution  : 720 x 576
Bytes / Pixel     : 2.00 (packed) (8 bit, 4:2:2 sampling)
Frame Size        : 829,440 bytes
File Type         : All frames in one container file (3,397,386,240 bytes).

Writing 4096 x 829440 byte frames into file u:/framestream.dat
555 frames in 5.00 secs ==> 111.00 FPS (87.80 MB/s)
551 frames in 5.00 secs ==> 110.20 FPS (87.17 MB/s)
470 frames in 5.73 secs ==> 81.96 FPS (64.83 MB/s)
217 frames in 6.08 secs ==> 35.70 FPS (28.24 MB/s)
141 frames in 5.00 secs ==> 28.20 FPS (22.31 MB/s)
198 frames in 6.08 secs ==> 32.58 FPS (25.77 MB/s)
138 frames in 9.89 secs ==> 13.95 FPS (11.04 MB/s)
498 frames in 10.47 secs ==> 47.57 FPS (37.63 MB/s)
559 frames in 5.00 secs ==> 111.80 FPS (88.43 MB/s)
320 frames in 5.00 secs ==> 64.00 FPS (50.62 MB/s)
254 frames in 5.00 secs ==> 50.80 FPS (40.18 MB/s)
195 frames in 2.81 secs ==> 69.33 FPS (54.84 MB/s)

Write Summary : 4096.00 frames in 71.06 secs
              :   13.95(min)   57.64(avg)  111.80(max) FPS
              :   11.04(min)   45.59(avg)   88.43(max) MB/s

Reading 4096 x 829440 byte frames from file u:/framestream.dat
read_frames:read_frames: CreateFile failed: 32.


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