diff options
Diffstat (limited to 'src/common.cc')
| -rw-r--r-- | src/common.cc | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/src/common.cc b/src/common.cc index d911e36..c0cd5d7 100644 --- a/src/common.cc +++ b/src/common.cc @@ -33,9 +33,28 @@ #include "config.h" #include "common.h" #include "system-alloc.h" +#include "base/commandlineflags.h" namespace tcmalloc { +// Define the maximum number of object per classe type to transfer between +// thread and central caches. Default is 32. +static int32 FLAGS_tcmalloc_transfer_num_objects; + +static const int32 kDefaultTransferNumObjecs = 32768; + +// The init function is provided to explicit initialize the variable value +// from the env. var to avoid C++ global construction that might defer its +// initialization after a malloc/new call. +static inline void InitTCMallocTransferNumObjects() +{ + if (UNLIKELY(FLAGS_tcmalloc_transfer_num_objects == 0)) { + const char *envval = getenv("TCMALLOC_TRANSFER_NUM_OBJ"); + FLAGS_tcmalloc_transfer_num_objects = !envval ? kDefaultTransferNumObjecs : + strtol(envval, NULL, 10); + } +} + // Note: the following only works for "n"s that fit in 32-bits, but // that is fine since we only use it for small sizes. static inline int LgFloor(size_t n) { @@ -90,13 +109,16 @@ int SizeMap::NumMoveSize(size_t size) { // - We go to the central freelist too often and we have to acquire // its lock each time. // This value strikes a balance between the constraints above. - if (num > 32) num = 32; + if (num > FLAGS_tcmalloc_transfer_num_objects) + num = FLAGS_tcmalloc_transfer_num_objects; return num; } // Initialize the mapping arrays void SizeMap::Init() { + InitTCMallocTransferNumObjects(); + // Do some sanity checking on add_amount[]/shift_amount[]/class_array[] if (ClassIndex(0) < 0) { Log(kCrash, __FILE__, __LINE__, |