Difference between revisions of "ZhoubaWiki:Bc-cpu-benchl"
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(Created page with "== Bc as CPU benchmark for multicore cpu == Referring to this http://tuxshell.blogspot.com/2009/08/bc-as-cpu-benchmark.html post, I figured out the simple way how to test spe...") |
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Referring to this http://tuxshell.blogspot.com/2009/08/bc-as-cpu-benchmark.html post, I figured out the simple way how to test speed of multicore cpu system or multi cpu system. This command: | Referring to this http://tuxshell.blogspot.com/2009/08/bc-as-cpu-benchmark.html post, I figured out the simple way how to test speed of multicore cpu system or multi cpu system. This command: | ||
| − | + | <pre> | |
$ time echo "scale=5000; a(1)*4" | bc -l | $ time echo "scale=5000; a(1)*4" | bc -l | ||
| − | + | </pre> | |
will only be executed on one CPU core. However we can use GNU parallel command to execute it many times on multicore cpu. First we create benchmark script b.sh as follows: | will only be executed on one CPU core. However we can use GNU parallel command to execute it many times on multicore cpu. First we create benchmark script b.sh as follows: | ||
| − | + | <pre> | |
#!/bin/bash | #!/bin/bash | ||
echo "scale=$1; a(1)*4" | bc -l | echo "scale=$1; a(1)*4" | bc -l | ||
| − | + | </pre> | |
The first argument is number of digits to calculate. Now we can run in parallel (4 times) this way | The first argument is number of digits to calculate. Now we can run in parallel (4 times) this way | ||
| − | + | <pre> | |
$ time parallel ./b.sh ::: 2000 2000 2000 2000 | $ time parallel ./b.sh ::: 2000 2000 2000 2000 | ||
| − | + | </pre> | |
We can determine the number of cores with this command: | We can determine the number of cores with this command: | ||
| − | + | <pre> | |
$ cat /proc/cpuinfo | grep processor | wc -l | $ cat /proc/cpuinfo | grep processor | wc -l | ||
4 | 4 | ||
| − | + | </pre> | |
If your cpu supports hyper threading - this will give you the number of logical cores, not only the physical ones | If your cpu supports hyper threading - this will give you the number of logical cores, not only the physical ones | ||
Latest revision as of 18:17, 19 September 2022
Bc as CPU benchmark for multicore cpu
Referring to this http://tuxshell.blogspot.com/2009/08/bc-as-cpu-benchmark.html post, I figured out the simple way how to test speed of multicore cpu system or multi cpu system. This command:
$ time echo "scale=5000; a(1)*4" | bc -l
will only be executed on one CPU core. However we can use GNU parallel command to execute it many times on multicore cpu. First we create benchmark script b.sh as follows:
#!/bin/bash echo "scale=$1; a(1)*4" | bc -l
The first argument is number of digits to calculate. Now we can run in parallel (4 times) this way
$ time parallel ./b.sh ::: 2000 2000 2000 2000
We can determine the number of cores with this command:
$ cat /proc/cpuinfo | grep processor | wc -l 4
If your cpu supports hyper threading - this will give you the number of logical cores, not only the physical ones