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Don't set max parallelism when only --min-paralellism is given.

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Setting --min-parallelism without also setting --max-parallelism would
force the max parallelism to the same value. So, for example,
--min-parallelism=1 would also limit the max parallelism to 1. This
patch, based on one by Chris Woodbury, allows the max parallelism to
rise above this minimum, up to the maximum defined by each scan phase.
This commit is contained in:
david
2012-04-07 08:07:38 +00:00
parent 05c713d22a
commit fd9260276c
6 changed files with 14 additions and 19 deletions
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6
timing.cc
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@@ -295,9 +295,9 @@ void ultra_timing_vals::drop_group(unsigned in_flight,
void scan_performance_vars::init() {
/* TODO: I should revisit these values for tuning. They should probably
at least be affected by -T. */
low_cwnd = MAX(o.min_parallelism, 1);
max_cwnd = o.max_parallelism? o.max_parallelism : 300;
group_initial_cwnd = box(o.min_parallelism, max_cwnd, 10);
low_cwnd = o.min_parallelism ? o.min_parallelism : 1;
max_cwnd = MAX(low_cwnd, o.max_parallelism ? o.max_parallelism : 300);
group_initial_cwnd = box(low_cwnd, max_cwnd, 10);
host_initial_cwnd = group_initial_cwnd;
slow_incr = 1;
/* The congestion window grows faster with more aggressive timing. */