mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-17 21:24:28 +00:00
a31adcfdea
* Wait test server startup for 5s * clean * Allow use system libcpuid * cpuid: move include/cpuid/ -> include/libcpuid/ * fix
66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
#include <Common/getNumberOfPhysicalCPUCores.h>
|
|
#include <thread>
|
|
#include <fstream>
|
|
|
|
#if defined(__x86_64__)
|
|
|
|
#include <libcpuid/libcpuid.h>
|
|
#include <Common/Exception.h>
|
|
|
|
namespace DB { namespace ErrorCodes { extern const int CPUID_ERROR; }}
|
|
|
|
#endif
|
|
|
|
|
|
unsigned getNumberOfPhysicalCPUCores()
|
|
{
|
|
#if defined(__linux__)
|
|
/// On Linux we try to look at Cgroups limit if it is available.
|
|
std::ifstream cgroup_read_in("/sys/fs/cgroup/cpu/cpu.cfs_quota_us");
|
|
if (cgroup_read_in.is_open())
|
|
{
|
|
std::string allocated_cpus_share_str{ std::istreambuf_iterator<char>(cgroup_read_in), std::istreambuf_iterator<char>() };
|
|
int allocated_cpus_share_int = std::stoi(allocated_cpus_share_str);
|
|
|
|
cgroup_read_in.close();
|
|
|
|
// If a valid value is present
|
|
if (allocated_cpus_share_int > 0)
|
|
{
|
|
unsigned allocated_cpus = (allocated_cpus_share_int + 999) / 1000;
|
|
return allocated_cpus;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#if defined(__x86_64__)
|
|
cpu_raw_data_t raw_data;
|
|
if (0 != cpuid_get_raw_data(&raw_data))
|
|
throw DB::Exception("Cannot cpuid_get_raw_data: " + std::string(cpuid_error()), DB::ErrorCodes::CPUID_ERROR);
|
|
|
|
cpu_id_t data;
|
|
if (0 != cpu_identify(&raw_data, &data))
|
|
throw DB::Exception("Cannot cpu_identify: " + std::string(cpuid_error()), DB::ErrorCodes::CPUID_ERROR);
|
|
|
|
/// On Xen VMs, libcpuid returns wrong info (zero number of cores). Fallback to alternative method.
|
|
if (data.num_logical_cpus == 0)
|
|
return std::thread::hardware_concurrency();
|
|
|
|
unsigned res = data.num_cores * data.total_logical_cpus / data.num_logical_cpus;
|
|
|
|
/// Also, libcpuid gives strange result on Google Compute Engine VMs.
|
|
/// Example:
|
|
/// num_cores = 12, /// number of physical cores on current CPU socket
|
|
/// total_logical_cpus = 1, /// total number of logical cores on all sockets
|
|
/// num_logical_cpus = 24. /// number of logical cores on current CPU socket
|
|
/// It means two-way hyper-threading (24 / 12), but contradictory, 'total_logical_cpus' == 1.
|
|
|
|
if (res != 0)
|
|
return res;
|
|
#endif
|
|
|
|
/// As a fallback (also for non-x86 architectures) assume there are no hyper-threading on the system.
|
|
/// (Actually, only Aarch64 is supported).
|
|
return std::thread::hardware_concurrency();
|
|
}
|