On Linux, broker defaults --worker-threads to the number of available CPU cores

reported by sysconf(_SC_NPROCESSORS_ONLN)


git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@593632 13f79535-47bb-0310-9956-ffa450edef68

2 files changed, 79 insertions, 0 deletions

diff --git a/cpp/src/qpid/sys/SystemInfo.cpp b/cpp/src/qpid/sys/SystemInfo.cpp
new file mode 100644
index 0000000000..dcc7ad9985
--- /dev/null
+++ b/cpp/src/qpid/sys/SystemInfo.cpp
@@ -0,0 +1,35 @@
+/*
+ * 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 "SystemInfo.h"
+#include <unistd.h>
+
+namespace qpid {
+namespace sys {
+
+long  SystemInfo::concurrency() {
+#ifdef _SC_NPROCESSORS_ONLN    // Linux specific.
+    return sysconf(_SC_NPROCESSORS_ONLN);
+#else
+    return -1;
+#endif
+}
+
+}} // namespace qpid::sys
diff --git a/cpp/src/qpid/sys/SystemInfo.h b/cpp/src/qpid/sys/SystemInfo.h
new file mode 100644
index 0000000000..73c3ca3c17
--- /dev/null
+++ b/cpp/src/qpid/sys/SystemInfo.h
@@ -0,0 +1,44 @@
+#ifndef QPID_SYS_SYSTEMINFO_H
+#define QPID_SYS_SYSTEMINFO_H
+
+/*
+ * 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.
+ *
+ */
+
+namespace qpid {
+namespace sys {
+
+/**
+ * Retrieve information about the system we are running on.
+ * Results may be dependent on OS/hardware. 
+ */
+class SystemInfo
+{
+  public:
+    /** Estimate available concurrency, e.g. number of CPU cores.
+     * -1 means estimate not available on this platform.
+     */
+    static long concurrency();
+};
+
+}} // namespace qpid::sys
+
+
+
+#endif  /*!QPID_SYS_SYSTEMINFO_H*/