add analyze and server_benchmark feature

--analyze uses malt to trace the benchmarks behavior. It uses the run
loop but the obtained results are not stored

Benchmark.server_benchmark is used if only a server is started for
each allocator and clients are used to measure its performance in the run loop.
If server_benchmark is set to True the cmds are run with the system default
allocator.

Misc changes:

* The global environment is no longer changed. Instead a custom env dict
is passed to suprocesses containing LD_PRELOAD.

* Failing cmds no longer skip the whole benchmark instead they now skip the
malfunctioning allocator.

* Fix default title in plot_single_arg

an analyse run are not stored

1 files changed, 4 insertions, 4 deletions

diff --git a/src/benchmarks/mysql.py b/src/benchmarks/mysql.py
index e3f1f0f..0ac3f75 100644
--- a/src/benchmarks/mysql.py
+++ b/src/benchmarks/mysql.py
@@ -51,12 +51,12 @@ class Benchmark_MYSQL(Benchmark):
 
         super().__init__()
 
-    def start_and_wait_for_server(self, cmd_prefix=""):
+    def start_and_wait_for_server(self, cmd_prefix="", env=None):
         actual_cmd = cmd_prefix.split() + server_cmd
         print_info("Starting server with:", actual_cmd)
 
         self.server = subprocess.Popen(actual_cmd, stdout=PIPE, stderr=PIPE,
-                                       universal_newlines=True)
+                                       env=env, universal_newlines=True)
         # TODO make sure server comes up !
         sleep(10)
         if self.server.poll() is not None:
@@ -135,8 +135,8 @@ class Benchmark_MYSQL(Benchmark):
             print_status("Delete mysqld directory")
             shutil.rmtree("mysql_test", ignore_errors=True)
 
-    def preallocator_hook(self, allocator, run, verbose):
-        if not self.start_and_wait_for_server(cmd_prefix=allocator[1]["cmd_prefix"]):
+    def preallocator_hook(self, allocator, run, env, verbose):
+        if not self.start_and_wait_for_server(cmd_prefix=allocator[1]["cmd_prefix"], env=env):
             print_debug(allocator[1]["cmd_prefix"], file=sys.stderr)
             raise Exception("Starting mysql server for {} failed with".format(allocator[0], self.server.returncode))