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Measure GC duration

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This commit is contained in:
Eelco Dolstra 2019-04-29 22:44:11 +02:00
parent 54e1ac6102
commit c6ff34bd86
2 changed files with 17 additions and 4 deletions
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20
src/libexpr/gc.cc
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@ -3,6 +3,8 @@
#include "attr-set.hh" #include "attr-set.hh"
#include "eval.hh" #include "eval.hh"
#include <chrono>
namespace nix { namespace nix {
GC gc; GC gc;
@ -44,10 +46,11 @@ GC::GC()
GC::~GC() GC::~GC()
{ {
printInfo("%d bytes in arenas, %d bytes allocated, %d bytes reclaimed by GC", debug("%d bytes in arenas, %d bytes allocated, %d bytes reclaimed, in %d ms",
totalSize * WORD_SIZE, totalSize * WORD_SIZE,
allTimeWordsAllocated * WORD_SIZE, allTimeWordsAllocated * WORD_SIZE,
allTimeWordsFreed * WORD_SIZE); allTimeWordsFreed * WORD_SIZE,
totalDurationMs);
size_t n = 0; size_t n = 0;
for (Ptr<Object> * p = frontPtrSentinel->next; p != backPtrSentinel; p = p->next) for (Ptr<Object> * p = frontPtrSentinel->next; p != backPtrSentinel; p = p->next)
@ -97,6 +100,10 @@ void GC::addToFreeList(Free * obj)
void GC::gc() void GC::gc()
{ {
typedef std::chrono::time_point<std::chrono::steady_clock> steady_time_point;
auto before = steady_time_point::clock::now();
size_t marked = 0; size_t marked = 0;
std::stack<Object *> stack; std::stack<Object *> stack;
@ -253,10 +260,15 @@ void GC::gc()
totalWordsFreed += wordsFreed; totalWordsFreed += wordsFreed;
} }
debug("freed %d bytes in %d dead objects, keeping %d objects", auto after = steady_time_point::clock::now();
totalWordsFreed * WORD_SIZE, totalObjectsFreed, marked);
auto durationMs = std::chrono::duration_cast<std::chrono::milliseconds>(after - before).count();
debug("freed %d bytes in %d dead objects, keeping %d objects, in %d ms",
totalWordsFreed * WORD_SIZE, totalObjectsFreed, marked, durationMs);
allTimeWordsFreed += totalWordsFreed; allTimeWordsFreed += totalWordsFreed;
totalDurationMs += durationMs;
} }
std::pair<size_t, size_t> GC::freeUnmarked(Arena & arena) std::pair<size_t, size_t> GC::freeUnmarked(Arena & arena)

1
src/libexpr/gc.hh
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@ -193,6 +193,7 @@ private:
size_t allTimeWordsAllocated = 0; size_t allTimeWordsAllocated = 0;
size_t allTimeWordsFreed = 0; size_t allTimeWordsFreed = 0;
uint64_t totalDurationMs = 0;
Object * allocObject(size_t size) Object * allocObject(size_t size)
{ {