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Mgruben
Advanced Cruncher Joined: May 26, 2013 Post Count: 94 Status: Offline Project Badges: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
Hey all,
----------------------------------------So I just put up a new Linux rig (Ubuntu desktop 12.04 amd64, i5 3470T processor, 4gb ram, AND a Mushkin Enhanced 60GB solid state drive). I'm a Linux newbie, so bear with me, but I've been with WCG for about 2 months now. Long story short, I installed iotop and ran sudo iotop -a, and am seeing that an "idle boinc" process manages to do a few MB of disk writes every second. Needless to say, I am troubled, as I have my client set to write to disk no more than every 900 seconds (since I hear this cuts down on SSD exhaustion). The SWAPIN and IO> columns are both at 0.00% for that process, and the COMMAND reads (enigmatically) "../../projects/www.wor~193244926253088 40002 0" There's also another "idle boinc" process which writes about a tenth as much, but still enough for me to be concerned about it, whose SWAPIN and IO> are also both 0.00%, and whose COMMAND is "../../projects/www.wor~_00.gpf -seed 225534140" In closing, halp. I'm not sure if I should be concerned about the high DISK WRITE numbers, and if I should be concerned how I can get them to shtahp. edit: iostat readings: Linux 3.5.0-37-generic (Linus) 08/10/2013 _x86_64_ (4 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 4.31 89.02 2.20 0.04 0.00 4.42 Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util sda 0.92 5.95 1.65 4.22 84.88 916.95 341.33 0.41 69.41 2.08 95.67 2.00 1.18 ![]() [Edit 1 times, last edit by Mgruben at Aug 10, 2013 11:14:53 PM] |
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OldChap
Veteran Cruncher UK Joined: Jun 5, 2009 Post Count: 978 Status: Offline Project Badges: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
Let me offer you some reading
----------------------------------------![]() http://www.howtogeek.com/62761/how-to-tweak-y...u-for-better-performance/ and https://sites.google.com/site/easylinuxtipsproject/ssd I'm thinking that noatime will help ![]() [Edit 1 times, last edit by OldChap at Aug 11, 2013 1:08:51 AM] |
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Sgt.Joe
Ace Cruncher USA Joined: Jul 4, 2006 Post Count: 7666 Status: Offline Project Badges: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
Which projects are you running ?
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Sgt. Joe
*Minnesota Crunchers* |
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Mgruben
Advanced Cruncher Joined: May 26, 2013 Post Count: 94 Status: Offline Project Badges: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
I'm signed up for all of them, and have changed CEP2 to be able to run more than 1 WU at a time (OldChap I've yet to go through your reading list)
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Mgruben
Advanced Cruncher Joined: May 26, 2013 Post Count: 94 Status: Offline Project Badges: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
OldChap,
----------------------------------------Will be going out of town tomorrow (not able to access the BIOS), but those resources look great (accurate and exhaustive), and I'll be sure to give them a look when I have the ability to sit down in front of the terminal again ![]() |
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Mgruben
Advanced Cruncher Joined: May 26, 2013 Post Count: 94 Status: Offline Project Badges: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
The easylinuxtipsproject/ssd helped a great deal; I'm down to very low (a few kB/s) writes per second according to iotop -a, even running a CEP2 work unit
----------------------------------------Thanks again for the advice ![]() |
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OldChap
Veteran Cruncher UK Joined: Jun 5, 2009 Post Count: 978 Status: Offline Project Badges: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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KerSamson
Master Cruncher Switzerland Joined: Jan 29, 2007 Post Count: 1673 Status: Offline Project Badges: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
Since 3 years, I use SSD on two hexacore Linux hosts (still 10.04, i.e. no trim available).
----------------------------------------The decision to switch to SSD was caused by the launch of CEP2. Finally, excepted for CEP2 (with more than two simultaneously computed WUs), the performance improvement of SSD is really not significant. All my hosts - using HDD or SSD - reach an average CPU performance better than 99.20% (according to boinctask). The improvement for CEP2 is less than 0.5% for one or two WUs, and around 1% for 6 simultaneously computed WUs. Additionally to a fast boot-up (but the systems are running 24/7/365), the only advantage using SSD are consumption and noise (?) however ventirad and power supply are more noisy than an HDD. In few words: The performance improvement brought by SSD is really small for WCG projects. Cheers, Yves |
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