Use more threads for zstd compression #365
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Despite the
-T0
option used in the current zstd command telling it to auto-detect the number of threads to use for compression, the current configuration is limited to single-thread compression due to the "ultra" (i.e. > 19) compression level.Here is the current behavior, compressing the Nvidia module with dkms (it takes forever and 100% of a single thread):
By lowering the compression level to the highest non-ultra compression level, we become multi-threaded (it takes 100% of three threads in my case):
Lowering the compression level a bit more, we scrounge up some time with a negligible weight gain:
I feel this setting is a good compromise between compression time (also power usage) and shrinking ratio.