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]]> Comment on Truth about drop_cache & sync and dealing with OOM Killer by admin http://oracledbahelp.com/?p=29&cpage=1#comment-3 admin Tue, 30 Jun 2009 06:32:32 +0000 http://oracledbahelp.com/?p=29#comment-3 Wow, that beats the heck out of me! Combining your article and above comment, I gather you noticed a significant portion of your memory gone to slab caches, but there was still 1G or more free memory while the OOM killer killed your processes. On a 64 bit box, running 64bit OS, I do not see how you could have free memory (as big as 1G) and still OOM killer went after your processes. Are you sure your memory utilization snapshot is not average over a period rather than a point in time? Coming to the part where you saw your data loss due to dropping cache does not seem right either. I have used this several times and never had any such issue. drop_cache can only drop clean caches, not dirty caches, and sync will definitely write dirty caches to disk. I still wonder how your application data is lost. What file system does the application write to? Anyhow, take a moment to update me if you find anything more! Cheers! Wow, that beats the heck out of me! Combining your article and above comment, I gather you noticed a significant portion of your memory gone to slab caches, but there was still 1G or more free memory while the OOM killer killed your processes. On a 64 bit box, running 64bit OS, I do not see how you could have free memory (as big as 1G) and still OOM killer went after your processes. Are you sure your memory utilization snapshot is not average over a period rather than a point in time?

Coming to the part where you saw your data loss due to dropping cache does not seem right either. I have used this several times and never had any such issue. drop_cache can only drop clean caches, not dirty caches, and sync will definitely write dirty caches to disk. I still wonder how your application data is lost. What file system does the application write to? Anyhow, take a moment to update me if you find anything more!

Cheers!

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