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#include "util/usage.hh"
#include "util/exception.hh"
#include <fstream>
#include <ostream>
#include <sstream>
#include <string.h>
#include <ctype.h>
#if !defined(_WIN32) && !defined(_WIN64)
#include <sys/resource.h>
#include <sys/time.h>
#include <unistd.h>
#endif
namespace util {
namespace {
#if !defined(_WIN32) && !defined(_WIN64)
float FloatSec(const struct timeval &tv) {
return static_cast<float>(tv.tv_sec) + (static_cast<float>(tv.tv_usec) / 1000000.0);
}
#endif
} // namespace
void PrintUsage(std::ostream &out) {
#if !defined(_WIN32) && !defined(_WIN64)
struct rusage usage;
if (getrusage(RUSAGE_SELF, &usage)) {
perror("getrusage");
return;
}
out << "user\t" << FloatSec(usage.ru_utime) << "\nsys\t" << FloatSec(usage.ru_stime) << '\n';
// Linux doesn't set memory usage :-(.
std::ifstream status("/proc/self/status", std::ios::in);
std::string line;
while (getline(status, line)) {
if (!strncmp(line.c_str(), "VmRSS:\t", 7)) {
out << "VmRSS: " << (line.c_str() + 7) << '\n';
break;
} else if (!strncmp(line.c_str(), "VmPeak:\t", 8)) {
out << "VmPeak: " << (line.c_str() + 8) << '\n';
}
}
#endif
}
uint64_t GuessPhysicalMemory() {
#if defined(_WIN32) || defined(_WIN64)
return 0;
#elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
long pages = sysconf(_SC_PHYS_PAGES);
if (pages == -1) return 0;
long page_size = sysconf(_SC_PAGESIZE);
if (page_size == -1) return 0;
return static_cast<uint64_t>(pages) * static_cast<uint64_t>(page_size);
#else
return 0;
#endif
}
namespace {
class SizeParseError : public Exception {
public:
explicit SizeParseError(const std::string &str) throw() {
*this << "Failed to parse " << str << " into a memory size ";
}
};
template <class Num> uint64_t ParseNum(const std::string &arg) {
std::stringstream stream(arg);
Num value;
stream >> value;
UTIL_THROW_IF_ARG(!stream, SizeParseError, (arg), "for the leading number.");
std::string after;
stream >> after;
UTIL_THROW_IF_ARG(after.size() > 1, SizeParseError, (arg), "because there are more than two characters after the number.");
std::string throwaway;
UTIL_THROW_IF_ARG(stream >> throwaway, SizeParseError, (arg), "because there was more cruft " << throwaway << " after the number.");
// Silly sort, using kilobytes as your default unit.
if (after.empty()) after == "K";
if (after == "%") {
uint64_t mem = GuessPhysicalMemory();
UTIL_THROW_IF_ARG(!mem, SizeParseError, (arg), "because % was specified but the physical memory size could not be determined.");
return static_cast<double>(value) * static_cast<double>(mem) / 100.0;
}
std::string units("bKMGTPEZY");
std::string::size_type index = units.find(after[0]);
UTIL_THROW_IF_ARG(index == std::string::npos, SizeParseError, (arg), "the allowed suffixes are " << units << "%.");
for (std::string::size_type i = 0; i < index; ++i) {
value *= 1024;
}
return value;
}
} // namespace
uint64_t ParseSize(const std::string &arg) {
return arg.find('.') == std::string::npos ? ParseNum<double>(arg) : ParseNum<uint64_t>(arg);
}
} // namespace util
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