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/**
* Copyright (C) 2013 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#include "mongo/db/startup_warnings.h"
#include <boost/filesystem/operations.hpp>
#include <fstream>
#include "mongo/db/storage_options.h"
#include "mongo/util/log.h"
#include "mongo/util/processinfo.h"
#include "mongo/util/version.h"
namespace mongo {
//
// system warnings
//
void logStartupWarnings() {
// each message adds a leading and a trailing newline
bool warned = false;
{
const char * foo = strchr(versionString , '.') + 1;
int bar = atoi(foo);
if ((2 * (bar / 2)) != bar) {
log() << startupWarningsLog;
log() << "** NOTE: This is a development version (" << versionString
<< ") of MongoDB." << startupWarningsLog;
log() << "** Not recommended for production." << startupWarningsLog;
warned = true;
}
}
if (sizeof(int*) == 4) {
log() << startupWarningsLog;
log() << "** NOTE: This is a 32 bit MongoDB binary." << startupWarningsLog;
log() << "** 32 bit builds are limited to less than 2GB of data "
<< "(or less with --journal)." << startupWarningsLog;
if (!storageGlobalParams.dur) {
log() << "** Note that journaling defaults to off for 32 bit "
<< "and is currently off." << startupWarningsLog;
}
log() << "** See http://dochub.mongodb.org/core/32bit" << startupWarningsLog;
warned = true;
}
if (!ProcessInfo::blockCheckSupported()) {
log() << startupWarningsLog;
log() << "** NOTE: your operating system version does not support the method that "
<< "MongoDB" << startupWarningsLog;
log() << "** uses to detect impending page faults." << startupWarningsLog;
log() << "** This may result in slower performance for certain use "
<< "cases" << startupWarningsLog;
warned = true;
}
#ifdef __linux__
if (boost::filesystem::exists("/proc/vz") && !boost::filesystem::exists("/proc/bc")) {
log() << startupWarningsLog;
log() << "** WARNING: You are running in OpenVZ which can cause issues on versions "
<< "of RHEL older than RHEL6." << startupWarningsLog;
warned = true;
}
bool hasMultipleNumaNodes = false;
try {
hasMultipleNumaNodes = boost::filesystem::exists("/sys/devices/system/node/node1");
} catch(boost::filesystem::filesystem_error& e) {
log() << startupWarningsLog;
log() << "** WARNING: Cannot detect if NUMA interleaving is enabled. "
<< "Failed to probe \"" << e.path1().string() << "\": " << e.code().message()
<< startupWarningsLog;
}
if (hasMultipleNumaNodes) {
// We are on a box with a NUMA enabled kernel and more than 1 numa node (they start at
// node0)
// Now we look at the first line of /proc/self/numa_maps
//
// Bad example:
// $ cat /proc/self/numa_maps
// 00400000 default file=/bin/cat mapped=6 N4=6
//
// Good example:
// $ numactl --interleave=all cat /proc/self/numa_maps
// 00400000 interleave:0-7 file=/bin/cat mapped=6 N4=6
std::ifstream f("/proc/self/numa_maps", std::ifstream::in);
if (f.is_open()) {
std::string line; //we only need the first line
std::getline(f, line);
if (f.fail()) {
warning() << "failed to read from /proc/self/numa_maps: "
<< errnoWithDescription() << startupWarningsLog;
warned = true;
}
else {
// skip over pointer
std::string::size_type where = line.find(' ');
if ((where == std::string::npos) || (++where == line.size())) {
log() << startupWarningsLog;
log() << "** WARNING: cannot parse numa_maps line: '" << line << "'"
<< startupWarningsLog;
warned = true;
}
// if the text following the space doesn't begin with 'interleave', then
// issue the warning.
else if (line.find("interleave", where) != where) {
log() << startupWarningsLog;
log() << "** WARNING: You are running on a NUMA machine."
<< startupWarningsLog;
log() << "** We suggest launching mongod like this to avoid "
<< "performance problems:" << startupWarningsLog;
log() << "** numactl --interleave=all mongod [other options]"
<< startupWarningsLog;
warned = true;
}
}
}
}
if (storageGlobalParams.dur) {
std::fstream f("/proc/sys/vm/overcommit_memory", ios_base::in);
unsigned val;
f >> val;
if (val == 2) {
log() << startupWarningsLog;
log() << "** WARNING: /proc/sys/vm/overcommit_memory is " << val
<< startupWarningsLog;
log() << "** Journaling works best with it set to 0 or 1"
<< startupWarningsLog;
}
}
if (boost::filesystem::exists("/proc/sys/vm/zone_reclaim_mode")){
std::fstream f("/proc/sys/vm/zone_reclaim_mode", ios_base::in);
unsigned val;
f >> val;
if (val != 0) {
log() << startupWarningsLog;
log() << "** WARNING: /proc/sys/vm/zone_reclaim_mode is " << val
<< startupWarningsLog;
log() << "** We suggest setting it to 0" << startupWarningsLog;
log() << "** http://www.kernel.org/doc/Documentation/sysctl/vm.txt"
<< startupWarningsLog;
}
}
#endif
#if defined(RLIMIT_NPROC) && defined(RLIMIT_NOFILE)
//Check that # of files rlmit > 1000 , and # of processes > # of files/2
const unsigned int minNumFiles = 1000;
const double filesToProcsRatio = 2.0;
struct rlimit rlnproc;
struct rlimit rlnofile;
if(!getrlimit(RLIMIT_NPROC,&rlnproc) && !getrlimit(RLIMIT_NOFILE,&rlnofile)){
if(rlnofile.rlim_cur < minNumFiles){
log() << startupWarningsLog;
log() << "** WARNING: soft rlimits too low. Number of files is "
<< rlnofile.rlim_cur
<< ", should be at least " << minNumFiles << startupWarningsLog;
}
if(false){
// juse to make things cleaner
}
#ifdef __APPLE__
else if(rlnproc.rlim_cur >= 709){
// os x doesn't make it easy to go higher
// ERH thinks its ok not to add the warning in this case 7/3/2012
}
#endif
else if(rlnproc.rlim_cur < rlnofile.rlim_cur/filesToProcsRatio){
log() << startupWarningsLog;
log() << "** WARNING: soft rlimits too low. rlimits set to "
<< rlnproc.rlim_cur << " processes, "
<< rlnofile.rlim_cur << " files. Number of processes should be at least "
<< rlnofile.rlim_cur/filesToProcsRatio << " : "
<< 1/filesToProcsRatio << " times number of files." << startupWarningsLog;
}
} else {
log() << startupWarningsLog;
log() << "** WARNING: getrlimit failed. " << errnoWithDescription()
<< startupWarningsLog;
}
#endif
#ifdef _WIN32
ProcessInfo p;
if (p.hasNumaEnabled()) {
log() << startupWarningsLog;
log() << "** WARNING: You are running on a NUMA machine."
<< startupWarningsLog;
log() << "** We suggest disabling NUMA in the machine BIOS "
<< startupWarningsLog;
log() << "** by enabling interleaving to avoid performance problems. "
<< startupWarningsLog;
log() << "** See your BIOS documentation for more information."
<< startupWarningsLog;
warned = true;
}
#endif // #ifdef _WIN32
if (warned) {
log() << startupWarningsLog;
}
}
} // namespace mongo
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