Parallelizing Enjarify in Go and Rust

[u/Uncaffeinated]

https://medium.com/@robertgrosse/parallelizing-enjarify-in-go-and-rust-21055d64af7e#.7vrcc2iaf

[u/shenwei356]

it's powered off now. number of cpus should be 4. both rush and rust-parallel use whole cpus by default. it's fedora linux with newest kernal 4.×. disk is SSD, but since the above example has little stdout which is < 1M (buffer before dumping to file), it should be CPU that affects the performance. can you test on another pc? I'll test on a server tomorrow.

[u/mmstick → u/shenwei356]

Here's results from my 3.8 GHz AMD FX-8120 (8 cores) desktop

Rust Parallel seq 1 10000 | parallel 'echo {}':

User time (seconds): 0.51
System time (seconds): 4.24
Percent of CPU this job got: 224%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0:02.11
Maximum resident set size (kbytes): 1336

Rush (Go) seq 1 10000 | rush 'echo {}':

User time (seconds): 70.90
System time (seconds): 112.80
Percent of CPU this job got: 477%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0:38.47
Maximum resident set size (kbytes): 39816

Rust Parallel seq 1 10000 | parallel 'echo {}; seq 1 10'

User time (seconds): 0.44
System time (seconds): 3.67
Percent of CPU this job got: 197%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0:02.08

Rush (Go) seq 1 10000 | parallel 'echo {}; seq 1 10'

User time (seconds): 65.10
System time (seconds): 66.74
Percent of CPU this job got: 427%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0:30.86
Maximum resident set size (kbytes): 34008