Pass --warmup along to pyperf (python#401)

* Pass --warmup along to pyperf

* Fixes

* Add comment about --warmups 0

Author: mdboom

pyperformance/cli.py

@@ -101,6 +101,8 @@ def parse_args():
                      choices=hook_names,
                      metavar=f"{', '.join(x for x in hook_names if not x.startswith('_'))}",
                      help="Apply the given pyperf hook(s) when running each benchmark")
+    cmd.add_argument("--warmups", type=int, default=None,
+                     help="number of skipped values per run used to warmup the benchmark")
     filter_opts(cmd)
 
     # show

pyperformance/run.py

@@ -247,5 +247,8 @@ def get_pyperf_opts(options):
     if options.hook:
         for hook in options.hook:
             opts.append('--hook=%s' % hook)
+    # --warmups=0 is a valid option, so check for `not None` here
+    if options.warmups is not None:
+        opts.append('--warmups=%s' % options.warmups)
 
     return opts