i've disabled [rrdstatus] and [rrddata]. i still have lots of I/O, practicaly no change.
i'm moved my www directory on another disk, and now most of the iowait is on the other disk. i then moved www in ramdisk, and all the iowait disapeared !
here is a paste of bbgen report, and then a paste of the unix bbgen report (witch are similar whether www is on disk or ram):
bbgen for Hobbit version 4.0.5RC1
Statistics: Hosts : 1617 Status messages : 8359 Purple messages : 8 Pages : 390
TIME SPENT Event Starttime Duration Startup 1121874341.021044 - Load links done 1121874341.021332 0.000288 Load bbhosts done 1121874341.147357 0.126025 ACK removal done 1121874341.147481 0.000124 Load STATE done 1121874341.540020 0.392539 Color calculation done 1121874341.542579 0.002559 Hobbit pagegen start 1121874341.542610 0.000031 Hobbit pagegen done 1121874344.373265 2.830655 BB2 generation done 1121874344.397772 0.024507 BBNK generation done 1121874344.399964 0.002192 Summary transmission done 1121874344.399968 0.000004 Run completed 1121874344.399969 0.000001 TIME TOTAL 3.378925
bbgen for Hobbit version 4.0.5RC1
Statistics: Hosts : 589 Status messages : 8359 Purple messages : 0 Pages : 1
TIME SPENT Event Starttime Duration Startup 1121874421.091144 - Load links done 1121874421.091429 0.000285 Load bbhosts done 1121874421.192460 0.101031 ACK removal done 1121874421.192561 0.000101 Load STATE done 1121874421.497978 0.305417 Color calculation done 1121874421.498891 0.000913 Hobbit pagegen start 1121874421.498925 0.000034 Hobbit pagegen done 1121874421.586783 0.087858 BB2 generation done 1121874421.606831 0.020048 BBNK generation done 1121874421.607756 0.000925 Run completed 1121874421.607758 0.000002 TIME TOTAL 0.516614
Selon Henrik Stoerner <henrik at hswn.dk>:
On Wed, Jul 20, 2005 at 04:54:56PM +0200, Olivier Beau wrote:
i loaded hobbit 4.0.5RC1 on my standby server (which isn't as fast as my production bbgen3.5 server..)
i'm having lots of iowait, (it isn't swapping), i suspect it's bbgen
It would be interesting to see the output from your "bbgen" column if you run bbgen with the "--report" option.
I haven't seen bbgen do very much I/O. Sure, you're generating 8x2 MB of data per minute, but most disk today will easily deliver 10 mbit/sec throughput. And it's not random access, just sequential writing of a single file.
I'd be more inclined to think it's your RRD file updates that are responsible for the disk I/O you see. Try disabling the [rrddata] and [rrdstatus] tasks in hobbitlaunch.cfg and see if the iowait drops.
--> Is there a way to disable the generating of the bb.html page for pagesets ?
No.
Regards, Henrik
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