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[ale] why would it take longer to delete a file than to create it?
- Subject: [ale] why would it take longer to delete a file than to create it?
- From: jheim at math.wisc.edu (John G. Heim)
- Date: Tue, 4 May 2010 17:29:22 -0500
I have this very slow database server. Today I noticed something strange
about it. I can create a large file via dd faster than I can delete it.
Look at the screen cap below... It took just 12 seconds to create the file
with a million 1K records but it took 36 seconds to delete it. Why would
that be? I'm running debian lenny with a 2.6.30 kernel. There are 2 500 Gb
disks in the machine configured as RAID-1. The file system on the disk is
ext3.
# date; dd if=/dev/zero of=zero.txt bs=1024 count=1000000; date; rm
zero.txt; date
Tue May 4 16:59:21 CDT 2010
1000000+0 records in
1000000+0 records out
1024000000 bytes (1.0 GB) copied, 11.7291 s, 87.3 MB/s
Tue May 4 16:59:33 CDT 2010
Tue May 4 17:00:09 CDT 2010