Viji V Nair wrote:
Hi,
System : Fedora 11 x86_64
Current Filesystem: 150G ext4 (formatted with "-T small" option)
Number of files: 50 Million, 1 to 30K png images
We are generating these files using a python programme and getting very
slow IO performance. While generation there in only write, no read.
After generation there is heavy read and no write.
I am looking for best practices/recommendation to get a better performance.
Any suggestions of the above are greatly appreciated.
Viji
I would start with using blktrace and/or seekwatcher to see what your IO
patterns look like when you're populating the disk; I would guess that
you're seeing IO scattered all over.
How you are placing the files in subdirectories will affect this quite a
lot; sitting in 1 directory for a while, filling with images, before
moving on to the next directory, will probably help. Putting each new
file in a new subdirectory will probably give very bad results.
-Eric
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
