im_concurrency_set, im_concurrency_get - set and get the number of
threads to use for evaluation
void im_concurrency_set( int concurrency )
int im_concurrency_get( void )
im_concurrency_set(3) and im_concurrency_get(3) set and get the number
of parallel threads VIPS should use to calculate pixels.
A value of zero (the default) means to get the number of threads from
the environment variable IM_CONCURRENCY. If that is not set, the number
of threads defaults to one.
Setting the number of threads only affects image evaluations which
start after that point, it will not change the behaviour of existing
Most command-line vips programs support the --vips-concurrency flag,
which can also be used to set the concurrency.
im_get_option_group(3), ‘VIPS manual,’ in accompanying documentation.
8 January 2007 IM_CONCURRENCY(3)