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Some micro-optimizations, including a memcpy that is faster than Linux for most distro/compiler versions.

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This commit is contained in:
Adam Ierymenko 2017-12-15 11:03:20 -08:00
parent cb8e7b4d5e
commit 0608704626
22 changed files with 163 additions and 81 deletions
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44
selftest.cpp
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@ -660,6 +660,50 @@ static int testOther()
std::cout << " " << InetAddress("").toString(buf);
std::cout << std::endl;
std::cout << "[other] Benchmarking memcpy... "; std::cout.flush();
{
unsigned char *bb = (unsigned char *)::malloc(1234567);
unsigned char *cc = (unsigned char *)::malloc(1234567);
for(unsigned int i=0;i<1234567;++i)
bb[i] = (unsigned char)i;
double bytes = 0.0;
uint64_t start = OSUtils::now();
for(unsigned int i=0;i<20000;++i) {
++bb[i];
++bb[i+1];
memcpy(cc,bb,1234567);
bytes += 1234567.0;
}
if (cc[0] != bb[0])
abort();
uint64_t end = OSUtils::now();
std::cout << ((bytes / 1048576.0) / ((long double)(end - start) / 1024.0)) << " MiB/second" << std::endl;
::free((void *)bb);
::free((void *)cc);
}
std::cout << "[other] Benchmarking ZT_FAST_MEMCPY... "; std::cout.flush();
{
unsigned char *bb = (unsigned char *)::malloc(1234567);
unsigned char *cc = (unsigned char *)::malloc(1234567);
for(unsigned int i=0;i<1234567;++i)
bb[i] = (unsigned char)i;
double bytes = 0.0;
uint64_t start = OSUtils::now();
for(unsigned int i=0;i<20000;++i) {
++bb[0];
++bb[1234566];
ZT_FAST_MEMCPY(cc,bb,1234567);
bytes += 1234567.0;
}
if (cc[0] != bb[0])
abort();
uint64_t end = OSUtils::now();
std::cout << ((bytes / 1048576.0) / ((long double)(end - start) / 1024.0)) << " MiB/second" << std::endl;
::free((void *)bb);
::free((void *)cc);
}
#if 0
std::cout << "[other] Testing Hashtable... "; std::cout.flush();
{