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Old 03-05-2011, 12:34 AM   #1
hellfire911
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O_DIRECT option of bonnie++


Hi, there
Is anybody know the O_DIRECT option of bonnie++ ??
I can't find it. Please help.
 
Old 03-05-2011, 01:04 AM   #2
syg00
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There doesn't appear to be one (yes, I saw your post in the other thread). Perhaps that person was referring to (and mis-interpreting) the -b option.

Perhaps you could have a look at fio as a benchmark instead.
 
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Old 03-05-2011, 02:01 AM   #3
hellfire911
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Thanks a lot, I noticed that -b option means not using disk write cache.
But I'm now doing a disk throughput test, it requires that I should turn the read cache off.
I've tested my disk with -b option, and compare the results, as -b option said, it nearly took no effect on read speed.
 
Old 03-05-2011, 02:14 AM   #4
syg00
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Why would you expect it to ?. Unless you're re-reading the same data.
 
Old 03-07-2011, 07:13 PM   #5
hellfire911
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I'm doing a hard disk throughput test which requires that both read cache and write cache must be disabled.
 
  


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