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update control over parallelism

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The SWUPD_NUM_THREADS env variable is now understood by all three
commands and overrides the default number of threads. Setting it to 1
is useful while debugging the code that runs inside threads (only one
thread hits breakpoints there). If SWUPD_NUM_THREADS is invalid, a
warning is printed and the variable gets ignored, i.e. the default
parallelism is used.

The hard-coded parallelism of 12 threads when analysing the file system
gets replaced with n, where n is the number of available CPUs. The default
is the same as before elsewhere (n for packing, 3 * n for fullfiles).

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
This commit is contained in:
Patrick Ohly
2016-12-01 11:19:35 -08:00
committed by tmarcu
parent f01d9ca6c8
commit 4e0fdd4193
5 changed files with 34 additions and 5 deletions
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include/swupd.h
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@@ -257,5 +257,6 @@ extern int system_argv(char *const argv[]);
extern int system_argv_fd(char *const argv[], int newstdin, int newstdout, int newstderr);
extern int system_argv_pipe(char *const argvp1[], int stdinp1, int stderrp1,
char *const argvp2[], int stdoutp2, int stderrp2);
extern int num_threads(float scaling);
#endif