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https://github.com/SCST-project/scst.git
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92f2da2e57
git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@728 d57e44dd-8a1f-0410-8b47-8ef2f437770f
65 lines
2.0 KiB
Bash
Executable File
65 lines
2.0 KiB
Bash
Executable File
#!/bin/bash
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############################################################################
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#
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# Script for testing block device I/O performance. Running this script on a
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# block device that is connected to a remote SCST target device allows to
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# test the performance of the transport protocols implemented in SCST. The
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# operation of this script is similar to iozone, while this script is easier
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# to use.
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#
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# Copyright (C) 2009 Bart Van Assche <bart.vanassche@gmail.com>.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation, version 2
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# of the License.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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############################################################################
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device="$1"
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log2_io_size=31 # 2 GB
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log2_min_blocksize=12 # 4096 bytes
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log2_max_blocksize=26 # 64 MB
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if [ ! -e "${device}" ]; then
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echo "Error: device ${device} does not exist."
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exit 1
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fi
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if [ ! -w "${device}" ]; then
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echo "Error: device ${device} is not writeable."
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exit 1
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fi
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if ! cmp -s -n $((2**log2_io_size)) "${device}" /dev/zero; then
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echo "Error: device ${device} still contains data."
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exit 1
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fi
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printf "%9s %8s %8s %8s %8s %8s %8s\n" blocksize W W W R R R
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for ((log2_blocksize = log2_max_blocksize; log2_blocksize >= log2_min_blocksize; log2_blocksize--))
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do
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bs=$((2**log2_blocksize))
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printf "%9d " ${bs}
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for ((i=0;i<3;i++))
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do
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elapsed="$(dd if=/dev/zero of="${device}" bs=${bs} oflag=direct 2>&1 \
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| sed -n 's/.* \([0-9.]*\) s,.*/\1/p')"
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printf "%8s " "${elapsed}"
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done
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for ((i=0;i<3;i++))
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do
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elapsed="$(dd if="${device}" of=/dev/null bs=${bs} iflag=direct 2>&1 \
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| sed -n 's/.* \([0-9.]*\) s,.*/\1/p')"
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printf "%8s " "${elapsed}"
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done
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printf "\n"
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done
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