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Raise posix descriptor limit if necessary

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This commit is contained in:
Simon Walton 2018-07-17 11:04:25 -07:00
parent 0cd5a24233
commit 0cc96f2be1
2 changed files with 26 additions and 0 deletions
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24
assignment-client/src/AssignmentClientMonitor.cpp
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@ -25,6 +25,9 @@
#include "AssignmentClientChildData.h"
#include "SharedUtil.h"
#include <QtCore/QJsonDocument>
#ifdef POSIX_SOURCE
#include <sys/resource.h>
#endif
const QString ASSIGNMENT_CLIENT_MONITOR_TARGET_NAME = "assignment-client-monitor";
const int WAIT_FOR_CHILD_MSECS = 1000;
@ -71,6 +74,7 @@ AssignmentClientMonitor::AssignmentClientMonitor(const unsigned int numAssignmen
auto& packetReceiver = DependencyManager::get<NodeList>()->getPacketReceiver();
packetReceiver.registerListener(PacketType::AssignmentClientStatus, this, "handleChildStatusPacket");
adjustOsResources(_numAssignmentClientForks);
// use QProcess to fork off a process for each of the child assignment clients
for (unsigned int i = 0; i < _numAssignmentClientForks; i++) {
spawnChildClient();
@ -372,3 +376,23 @@ bool AssignmentClientMonitor::handleHTTPRequest(HTTPConnection* connection, cons
return true;
}
void AssignmentClientMonitor::adjustOsResources(unsigned int numForks) const
{
#ifdef _POSIX_SOURCE
// QProcess on Unix uses six descriptors, some temporarily, for each child proc.
unsigned requiredDescriptors = 30 + 6 * numForks;
struct rlimit descLimits;
if (getrlimit(RLIMIT_NOFILE, &descLimits) == 0) {
if (descLimits.rlim_cur < requiredDescriptors) {
descLimits.rlim_cur = requiredDescriptors;
if (setrlimit(RLIMIT_NOFILE, &descLimits) == 0) {
qDebug() << "Resetting descriptor limit to" << requiredDescriptors;
} else {
const char *const errorString = strerror(errno);
qDebug() << "Failed to reset descriptor limit to" << requiredDescriptors << ":" << errorString;
}
}
}
#endif
}

2
assignment-client/src/AssignmentClientMonitor.h
View file

@ -23,6 +23,7 @@
#include "AssignmentClientChildData.h"
#include <HTTPManager.h>
#include <HTTPConnection.h>
#include <sys/resource.h>
extern const char* NUM_FORKS_PARAMETER;
@ -55,6 +56,7 @@ public slots:
private:
void spawnChildClient();
void simultaneousWaitOnChildren(int waitMsecs);
void adjustOsResources(unsigned int numForks) const;
QTimer _checkSparesTimer; // every few seconds see if it need fewer or more spare children