Tweak concurrency limits

Create capacity for 2x max, but lie about it

1 files changed, 5 insertions, 1 deletions

diff --git a/src/common/threadpool.cpp b/src/common/threadpool.cpp
index f7f9bbbaf..41d0c25e0 100644
--- a/src/common/threadpool.cpp
+++ b/src/common/threadpool.cpp
@@ -39,7 +39,7 @@ namespace tools
 threadpool::threadpool() : running(true), active(0) {
   boost::thread::attributes attrs;
   attrs.set_stack_size(THREAD_STACK_SIZE);
-  max = tools::get_max_concurrency();
+  max = tools::get_max_concurrency() * 2;
   size_t i = max;
   while(i--) {
     threads.push_back(boost::thread(attrs, boost::bind(&threadpool::run, this)));
@@ -73,6 +73,10 @@ void threadpool::submit(waiter *obj, std::function<void()> f) {
   }
 }
 
+int threadpool::get_max_concurrency() {
+  return max / 2;
+}
+
 void threadpool::waiter::wait() {
   boost::unique_lock<boost::mutex> lock(mt);
   while(num) cv.wait(lock);