Threads allocated for "copy" targets

[Tekin Ozbek]

If I am copying (hypothetically) 100,000 files from the source tree to the output directory, does ninja use one thread per file copied, or does it use one thread for the whole copy operation?

Thanks.

Tekin

[Tekin Ozbek]

Should have added the rule to the copy command...

rule copy

  command = cp ${in} ${out}

where in and out are individual files and not directories. So each copy target has one file copied. My guess is that ninja just allocates a different thread for each target, and it does not know about (or guess) CPU vs IO bound commands.

[Evan Martin]

Each task like “cp” is a process, and ninja executes processes in parallel based on the -j flag etc. it does not guess about what the commands do but you can provide hints via the “pool” syntax, see the manual for more. 

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