Check in the benchmarking shell python wrapper from tibbe/bos's event…

… library.

test/benchmark_shell.py

@@ -0,0 +1,86 @@
+#!/usr/bin/python
+#
+# This program is intended to be run via sudo, and does the following
+# things:
+#
+# 1. Sets up a high-performance networking environment by tweaking
+#    various sysctl settings.
+# 2. Runs either an interactive shell or a command line program.
+# 3. Resets the environment back to what it was.
+
+import os, sys, tempfile
+
+sysctls = dict(
+    Darwin={
+        'kern.ipc.somaxconn': 1024,
+        'kern.maxfiles': 22528,
+        'kern.maxfilesperproc': 20480,
+        'net.inet.ip.portrange.first': 1024,
+        'net.inet.ip.portrange.hifirst': 1024,
+        },
+    Linux={
+        'net.core.somaxconn': 1024,
+        'net.core.rmem_max': 16777216,
+        'net.core.wmem_max': 16777216,
+        'net.ipv4.ip_local_port_range': '1024 65535',
+        'net.ipv4.tcp_fin_timeout': 15,
+        'net.ipv4.tcp_max_syn_backlog': 16384,
+        'net.ipv4.tcp_rmem': '4096 87380 16777216',
+        'net.ipv4.tcp_tw_recycle': 1,
+        'net.ipv4.tcp_tw_reuse': 1,
+        'net.ipv4.tcp_wmem': '4096 65536 16777216',
+        },
+    )
+
+ulimits = dict(
+    Darwin={
+        '-n': 20480,
+        },
+    Linux={
+        '-n': 131072,
+        },
+    )
+
+if os.access('/sbin/sysctl', os.X_OK):
+    sysctl = '/sbin/sysctl'
+elif os.access('/usr/sbin/sysctl', os.X_OK):
+    sysctl = '/usr/sbin/sysctl'
+else:
+    print >> sys.stderr, 'where is sysctl!?'
+    sys.exit(1)
+
+changed_sysctls = {}
+
+def change_sysctl(name, newval):
+    oldval = os.popen('%s -n %s' % (sysctl, name), 'r').read().strip().replace('\t', ' ')
+    if not oldval:
+        print >> sys.stderr, 'could not get value of ' + name
+        return
+    if oldval == str(newval):
+        return
+    ret = os.system('%s -w %s=%r 2>/dev/null' % (sysctl, name, newval))
+    if ret != 0:
+        print >> sys.stderr, 'could not change %s from %s to %r' % (name, oldval, newval)
+        return
+    changed_sysctls[name] = oldval
+
+platform = os.uname()[0]
+
+for (n,v) in sysctls[platform].iteritems():
+    change_sysctl(n,v)
+
+fd, path = tempfile.mkstemp('.sh')
+
+fp = os.fdopen(fd, 'w')
+for (n, v) in ulimits[platform].iteritems():
+    print >> fp, 'ulimit %s %s' % (n, v)
+    if len(sys.argv) > 1:
+        print >> fp, 'exec ' + ' '.join(sys.argv[1:])
+    else:
+        print >> fp, 'exec %s -l' % os.environ.get('SHELL', '/bin/bash')
+fp.close()
+os.system('exec /bin/sh ' + path)
+os.unlink(path)
+
+for (n,v) in changed_sysctls.iteritems():
+    change_sysctl(n,v)