exp show: lockless behavior

dvc/commands/experiments/show.py

@@ -480,6 +480,7 @@ def run(self):
                 num=self.args.num,
                 sha_only=self.args.sha,
                 param_deps=self.args.param_deps,
+                fetch_running=self.args.fetch_running,
             )
         except DvcException:
             logger.exception("failed to show experiments")
@@ -645,4 +646,10 @@ def add_parser(experiments_subparsers, parent_parser):
         default=False,
         help="Open the Parallel Coordinates Plot directly in the browser.",
     )
+    experiments_show_parser.add_argument(
+        "--no-fetch",
+        dest="fetch_running",
+        action="store_false",
+        help=argparse.SUPPRESS,
+    )
     experiments_show_parser.set_defaults(func=CmdExperimentsShow)

dvc/repo/experiments/__init__.py

@@ -742,7 +742,7 @@ def get_exact_name(self, rev: str):
             return self.stash_revs[rev].name
         return None
 
-    def get_running_exps(self) -> Dict[str, int]:
+    def get_running_exps(self, fetch_refs: bool = True) -> Dict[str, int]:
         """Return info for running experiments."""
         from dvc.scm import InvalidRemoteSCMRepo
         from dvc.utils.serialize import load_json
@@ -774,7 +774,7 @@ def get_running_exps(self) -> Dict[str, int]:
                         result[rev] = info.asdict()
                 else:
                     result[rev] = info.asdict()
-                    if info.git_url:
+                    if info.git_url and fetch_refs:
 
                         def on_diverged(_ref: str, _checkpoint: bool):
                             return False

dvc/repo/experiments/show.py

@@ -1,15 +1,17 @@
 import logging
 from collections import OrderedDict, defaultdict
 from datetime import datetime
-from typing import Any, Callable, Dict, List, Optional, Union
+from typing import TYPE_CHECKING, Any, Callable, Dict, List, Optional, Union
 
-from dvc.repo import Repo, locked  # pylint: disable=unused-import
 from dvc.repo.experiments.base import ExpRefInfo
 from dvc.repo.metrics.show import _gather_metrics
 from dvc.repo.params.show import _gather_params
 from dvc.scm import iter_revs
 from dvc.utils import error_handler, onerror_collect
 
+if TYPE_CHECKING:
+    from dvc.repo import Repo
+
 logger = logging.getLogger(__name__)
 
 
@@ -124,7 +126,6 @@ def _collect_experiment_branch(
     return res
 
 
-@locked
 def show(
     repo: "Repo",
     all_branches=False,
@@ -135,6 +136,7 @@ def show(
     num=1,
     param_deps=False,
     onerror: Optional[Callable] = None,
+    fetch_running: bool = True,
 ):
 
     if onerror is None:
@@ -152,7 +154,7 @@ def show(
         iter_revs(repo.scm, revs, num, all_branches, all_tags, all_commits)
     )
 
-    running = repo.experiments.get_running_exps()
+    running = repo.experiments.get_running_exps(fetch_refs=fetch_running)
 
     for rev in found_revs:
         res[rev]["baseline"] = _collect_experiment_commit(

tests/unit/command/test_experiments.py

@@ -118,6 +118,7 @@ def test_experiments_show(dvc, scm, mocker):
         revs="foo",
         sha_only=True,
         param_deps=True,
+        fetch_running=True,
     )