tests/migration: introduce multifd into guestperf

Guestperf tool does not cover the multifd-enabled migration
currently, it is worth supporting so that developers can
analysis the migration performance with all kinds of
migration.

To request that multifd is enabled, with 4 channels:
$ ./tests/migration/guestperf.py \
    --multifd --multifd-channels 4 --output output.json

To run the entire standardized set of multifd-enabled
comparisons, with unix migration:
$ ./tests/migration/guestperf-batch.py \
    --dst-host localhost --transport unix \
    --filter compr-multifd* --output outputdir

Signed-off-by: Hyman Huang(黄勇) <huangy81@chinatelecom.cn>
Message-Id: <cfeeb04d17ad932c42a9871294058b77429ad1b7.1616171924.git.huangy81@chinatelecom.cn>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

tests/migration/guestperf/comparison.py

@@ -121,4 +121,18 @@ COMPARISONS = [
         Scenario("compr-xbzrle-cache-50",
                  compression_xbzrle=True, compression_xbzrle_cache=50),
     ]),
+
+
+    # Looking at effect of multifd with
+    # varying numbers of channels
+    Comparison("compr-multifd", scenarios = [
+        Scenario("compr-multifd-channels-4",
+                 multifd=True, multifd_channels=2),
+        Scenario("compr-multifd-channels-8",
+                 multifd=True, multifd_channels=8),
+        Scenario("compr-multifd-channels-32",
+                 multifd=True, multifd_channels=32),
+        Scenario("compr-multifd-channels-64",
+                 multifd=True, multifd_channels=64),
+    ]),
 ]

tests/migration/guestperf/engine.py

@@ -188,6 +188,22 @@ class Engine(object):
                                    1024 * 1024 * 1024 / 100 *
                                    scenario._compression_xbzrle_cache))
 
+        if scenario._multifd:
+            resp = src.command("migrate-set-capabilities",
+                               capabilities = [
+                                   { "capability": "multifd",
+                                     "state": True }
+                               ])
+            resp = src.command("migrate-set-parameters",
+                               multifd_channels=scenario._multifd_channels)
+            resp = dst.command("migrate-set-capabilities",
+                               capabilities = [
+                                   { "capability": "multifd",
+                                     "state": True }
+                               ])
+            resp = dst.command("migrate-set-parameters",
+                               multifd_channels=scenario._multifd_channels)
+
         resp = src.command("migrate", uri=connect_uri)
 
         post_copy = False

tests/migration/guestperf/scenario.py

@@ -29,7 +29,8 @@ class Scenario(object):
                  post_copy=False, post_copy_iters=5,
                  auto_converge=False, auto_converge_step=10,
                  compression_mt=False, compression_mt_threads=1,
-                 compression_xbzrle=False, compression_xbzrle_cache=10):
+                 compression_xbzrle=False, compression_xbzrle_cache=10,
+                 multifd=False, multifd_channels=2):
 
         self._name = name
 
@@ -56,6 +57,9 @@ class Scenario(object):
         self._compression_xbzrle = compression_xbzrle
         self._compression_xbzrle_cache = compression_xbzrle_cache # percentage of guest RAM
 
+        self._multifd = multifd
+        self._multifd_channels = multifd_channels
+
     def serialize(self):
         return {
             "name": self._name,
@@ -73,6 +77,8 @@ class Scenario(object):
             "compression_mt_threads": self._compression_mt_threads,
             "compression_xbzrle": self._compression_xbzrle,
             "compression_xbzrle_cache": self._compression_xbzrle_cache,
+            "multifd": self._multifd,
+            "multifd_channels": self._multifd_channels,
         }
 
     @classmethod
@@ -92,4 +98,6 @@ class Scenario(object):
             data["compression_mt"],
             data["compression_mt_threads"],
             data["compression_xbzrle"],
-            data["compression_xbzrle_cache"])
+            data["compression_xbzrle_cache"],
+            data["multifd"],
+            data["multifd_channels"])

tests/migration/guestperf/shell.py

@@ -122,6 +122,11 @@ class Shell(BaseShell):
         parser.add_argument("--compression-xbzrle", dest="compression_xbzrle", default=False, action="store_true")
         parser.add_argument("--compression-xbzrle-cache", dest="compression_xbzrle_cache", default=10, type=int)
 
+        parser.add_argument("--multifd", dest="multifd", default=False,
+                            action="store_true")
+        parser.add_argument("--multifd-channels", dest="multifd_channels",
+                            default=2, type=int)
+
     def get_scenario(self, args):
         return Scenario(name="perfreport",
                         downtime=args.downtime,
@@ -142,7 +147,10 @@ class Shell(BaseShell):
                         compression_mt_threads=args.compression_mt_threads,
 
                         compression_xbzrle=args.compression_xbzrle,
-                        compression_xbzrle_cache=args.compression_xbzrle_cache)
+                        compression_xbzrle_cache=args.compression_xbzrle_cache,
+
+                        multifd=args.multifd,
+                        multifd_channels=args.multifd_channels)
 
     def run(self, argv):
         args = self._parser.parse_args(argv)