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I suspect that the bottleneck is writing to the USB flash drive. USB flash drives are typically at the low end of the performance/price range. Data accumulates in memory at 10MB/s up to a point, then gets written out at 200kB/s. You can try playing with the vm.dirty_bytes and vm.dirty_background_bytes kernel parameters. Setting them to a lower value might ...


It turns out this was quite specific to the context described above. I was using uWSGI to serve my site using emperor mode. I set the parameters uid=www-data and gid=www-data. I expected this to cause my vassal processes to have the permissions associated with the user and the group www-data as well as the permissions associated with any group to which ...

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