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Diffstat (limited to 'results/classifier/deepseek-2-tmp/output/performance/1751264')
| -rw-r--r-- | results/classifier/deepseek-2-tmp/output/performance/1751264 | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/results/classifier/deepseek-2-tmp/output/performance/1751264 b/results/classifier/deepseek-2-tmp/output/performance/1751264 new file mode 100644 index 00000000..67e97718 --- /dev/null +++ b/results/classifier/deepseek-2-tmp/output/performance/1751264 @@ -0,0 +1,26 @@ + +qemu-img convert issue in a tmpfs partition + +qemu-img convert command is slow when the file to convert is located in a tmpfs formatted partition. + +v2.1.0 on debian/jessie x64, ext4: 10m14s +v2.1.0 on debian/jessie x64, tmpfs: 10m15s + +v2.1.0 on debian/stretch x64, ext4: 11m9s +v2.1.0 on debian/stretch x64, tmpfs: 10m21.362s + +v2.8.0 on debian/jessie x64, ext4: 10m21s +v2.8.0 on debian/jessie x64, tmpfs: Too long + +v2.8.0 on debian/stretch x64, ext4: 10m42s +v2.8.0 on debian/stretch x64, tmpfs: Too long + +It seems that the issue is caused by this commit : https://github.com/qemu/qemu/commit/690c7301600162421b928c7f26fd488fd8fa464e + +In order to reproduce this bug : + +1/ mount a tmpfs partition : mount -t tmpfs tmpfs /tmp +2/ get a vmdk file (we used a 15GB image) and put it on /tmp +3/ run the 'qemu-img convert -O qcow2 /tmp/file.vmdk /path/to/destination' command + +When we trace the process, we can see that there's a lseek loop which is very slow (compare to outside a tmpfs partition). \ No newline at end of file |