martinzink commented on a change in pull request #1032: URL: https://github.com/apache/nifi-minifi-cpp/pull/1032#discussion_r621970958
########## File path: libminifi/src/utils/SystemCPUUsageTracker.cpp ########## @@ -0,0 +1,190 @@ +/** + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "utils/SystemCPUUsageTracker.h" + +namespace org { +namespace apache { +namespace nifi { +namespace minifi { +namespace utils { +#ifdef __linux__ + +SystemCPUUsageTracker::SystemCPUUsageTracker() : + total_user_(0), previous_total_user_(0), + total_user_low_(0), previous_total_user_low_(0), + total_sys_(0), previous_total_sys_(0), + total_idle_(0), previous_total_idle_(0) { + queryCPUTimes(); +} + +double SystemCPUUsageTracker::getCPUUsageAndRestartCollection() { + queryCPUTimes(); + if (isCurrentQuerySameAsPrevious() || isCurrentQueryOlderThanPrevious()) { + return -1.0; + } else { + return getCPUUsageBetweenLastTwoQueries(); + } +} + +void SystemCPUUsageTracker::queryCPUTimes() { + previous_total_user_ = total_user_; + previous_total_user_low_ = total_user_low_; + previous_total_sys_ = total_sys_; + previous_total_idle_ = total_idle_; + FILE* file = fopen("/proc/stat", "r"); + if (fscanf(file, "cpu %lu %lu %lu %lu", &total_user_, &total_user_low_, &total_sys_, &total_idle_) != 4) { + total_user_ = previous_total_user_; + total_user_low_ = previous_total_user_low_; + total_idle_ = previous_total_idle_; + total_sys_ = previous_total_sys_; + } + fclose(file); +} + +bool SystemCPUUsageTracker::isCurrentQueryOlderThanPrevious() const { + return (total_user_ < previous_total_user_ || + total_user_low_ < previous_total_user_low_ || + total_sys_ < previous_total_sys_ || + total_idle_ < previous_total_idle_); +} + +bool SystemCPUUsageTracker::isCurrentQuerySameAsPrevious() const { + return (total_user_ == previous_total_user_ && + total_user_low_ == previous_total_user_low_ && + total_sys_ == previous_total_sys_ && + total_idle_ == previous_total_idle_); +} + +double SystemCPUUsageTracker::getCPUUsageBetweenLastTwoQueries() const { + uint64_t total_user_diff = total_user_ - previous_total_user_; + uint64_t total_user_low_diff = total_user_low_ - previous_total_user_low_; + uint64_t total_system_diff = total_sys_ - previous_total_sys_; + uint64_t total_idle_diff = total_idle_ - previous_total_idle_; + uint64_t total_diff = total_user_diff + total_user_low_diff + total_system_diff; + double percent = static_cast<double>(total_diff)/static_cast<double>(total_diff+total_idle_diff); + + return percent; +} +#endif // linux + +#ifdef WIN32 +SystemCPUUsageTracker::SystemCPUUsageTracker() : + total_idle_(0), total_sys_(0), total_user_(0), + previous_total_idle_(0), previous_total_sys_(0), previous_total_user_(0) { + queryCPUTimes(); +} + +double SystemCPUUsageTracker::getCPUUsageAndRestartCollection() { + queryCPUTimes(); + if (isCurrentQuerySameAsPrevious() || isCurrentQueryOlderThanPrevious()) { + return -1.0; + } else { + return getCPUUsageBetweenLastTwoQueries(); + } +} + +void SystemCPUUsageTracker::queryCPUTimes() { + previous_total_user_ = total_user_; + previous_total_sys_ = total_sys_; + previous_total_idle_ = total_idle_; + FILETIME fidle, fsys, fuser; + GetSystemTimes(&fidle, &fsys, &fuser); + total_user_ = ULARGE_INTEGER{ fuser.dwLowDateTime, fuser.dwHighDateTime }.QuadPart; + total_sys_ = ULARGE_INTEGER{ fsys.dwLowDateTime, fsys.dwHighDateTime }.QuadPart; + total_idle_ = ULARGE_INTEGER{ fidle.dwLowDateTime, fidle.dwHighDateTime }.QuadPart; +} + +bool SystemCPUUsageTracker::isCurrentQueryOlderThanPrevious() const { + return (total_user_ < previous_total_user_ || + total_sys_ < previous_total_sys_ || + total_idle_ < previous_total_idle_); +} + +bool SystemCPUUsageTracker::isCurrentQuerySameAsPrevious() const { + return (total_user_ == previous_total_user_ && + total_sys_ == previous_total_sys_ && + total_idle_ == previous_total_idle_); +} + +double SystemCPUUsageTracker::getCPUUsageBetweenLastTwoQueries() const { + uint64_t total_user_diff = total_user_ - previous_total_user_; + uint64_t total_sys_diff = total_sys_ - previous_total_sys_; + uint64_t total_idle_diff = total_idle_ - previous_total_idle_; + uint64_t total_diff = total_user_diff + total_sys_diff; + double percent = static_cast<double>(total_diff - total_idle_diff) / static_cast<double>(total_diff); + + return percent; +} +#endif // windows + +#ifdef __APPLE__ +SystemCPUUsageTracker::SystemCPUUsageTracker() : + total_ticks_(0), previous_total_ticks_(0), + idle_ticks_(0), previous_idle_ticks_(0) { + queryCPUTicks(); +} + +double SystemCPUUsageTracker::getCPUUsageAndRestartCollection() { + queryCPUTicks(); + if (isCurrentQuerySameAsPrevious() || isCurrentQueryOlderThanPrevious()) { + return -1.0; + } else { + return getCPUUsageBetweenLastTwoQueries(); + } +} + +void SystemCPUUsageTracker::queryCPUTicks() { + host_cpu_load_info_data_t cpuinfo; + mach_msg_type_number_t count = HOST_CPU_LOAD_INFO_COUNT; + auto query_result = host_statistics(mach_host_self(), HOST_CPU_LOAD_INFO, (host_info_t)&cpuinfo, &count); + if (query_result == KERN_SUCCESS) { + previous_total_ticks_ = total_ticks_; + previous_idle_ticks_ = idle_ticks_; + total_ticks_ = 0; + for (int i = 0; i < CPU_STATE_MAX; i++) { + total_ticks_ += cpuinfo.cpu_ticks[i]; + } + idle_ticks_ = cpuinfo.cpu_ticks[CPU_STATE_IDLE]; + } Review comment: Yeah, apples cpp documentation is not the best. The basic idea is the same as in the other platforms, I've got the idea to use host_statistics from forums, but managed to verify it: Apple uses this in very similar fashion: https://github.com/apple/foundationdb/blob/6571e9e78cd0f22af5e283f0d5b7c3dde661afc4/flow/Platform.actor.cpp#L1177 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
