Re: [PATCH] Conditional count update for fast coverage test in multi-threaded programs

On Fri, Dec 20, 2013 at 11:45 PM, Rong Xu wrote: > Here are the results using our internal benchmarks which are a mixed a > multi-threaded and single-threaded programs. > This was collected about a month ago but I did not got time to send > due to an unexpected trip. > > cmpxchg gives the worst pe

Re: [PATCH] Conditional count update for fast coverage test in multi-threaded programs

Here are the results using our internal benchmarks which are a mixed a multi-threaded and single-threaded programs. This was collected about a month ago but I did not got time to send due to an unexpected trip. cmpxchg gives the worst performance due to the memory barriers it incurs. I'll send a p

Re: [PATCH] Conditional count update for fast coverage test in multi-threaded programs

On Mon, Nov 25, 2013 at 2:11 AM, Richard Biener wrote: > On Fri, Nov 22, 2013 at 10:49 PM, Rong Xu wrote: >> On Fri, Nov 22, 2013 at 4:03 AM, Richard Biener >> wrote: >>> On Fri, Nov 22, 2013 at 4:51 AM, Rong Xu wrote: Hi, This patch injects a condition into the instrumented code

Re: [PATCH] Conditional count update for fast coverage test in multi-threaded programs

On Fri, Nov 22, 2013 at 10:49 PM, Rong Xu wrote: > On Fri, Nov 22, 2013 at 4:03 AM, Richard Biener > wrote: >> On Fri, Nov 22, 2013 at 4:51 AM, Rong Xu wrote: >>> Hi, >>> >>> This patch injects a condition into the instrumented code for edge >>> counter update. The counter value will not be upda

Re: [PATCH] Conditional count update for fast coverage test in multi-threaded programs

On Fri, Nov 22, 2013 at 4:03 AM, Richard Biener wrote: > On Fri, Nov 22, 2013 at 4:51 AM, Rong Xu wrote: >> Hi, >> >> This patch injects a condition into the instrumented code for edge >> counter update. The counter value will not be updated after reaching >> value 1. >> >> The feature is under a

Re: [PATCH] Conditional count update for fast coverage test in multi-threaded programs

On Fri, Nov 22, 2013 at 4:51 AM, Rong Xu wrote: > Hi, > > This patch injects a condition into the instrumented code for edge > counter update. The counter value will not be updated after reaching > value 1. > > The feature is under a new parameter --param=coverage-exec_once. > Default is disabled

[PATCH] Conditional count update for fast coverage test in multi-threaded programs

Hi, This patch injects a condition into the instrumented code for edge counter update. The counter value will not be updated after reaching value 1. The feature is under a new parameter --param=coverage-exec_once. Default is disabled and setting to 1 to enable. This extra check usually slows the