# print perf headers

def print_feat(feat):
    print("# Measured on %s (%s)" % (
            feat.hostname.hostname,
            feat.osrelease.osrelease))
    print("# %s, %s" % (
            feat.cpudesc.cpudesc,
            feat.cpuid.cpuid))
    print("# %s" % (" ".join(map(lambda x: x.cmdline, feat.cmdline.cmdline))))