add no-sleep emper variant and move baseline benchmarks

eval.py

@@ -22,16 +22,18 @@ EMPER_ROOT = ROOT_DIR / 'emper'
 ARTIFACT_DESC = subprocess.check_output(
     'git describe --dirty --always'.split(), cwd=ROOT_DIR, text=True)[:-1]
 
-TARGETS = {}
-
-EMPER_VARIANTS = {
+TARGETS = {
     'baseline': {
         'cmd': f'{EMPER_ROOT}/build-vanilla/eval/io_latency --data baseline'
     },
     'iouring': {
         'cmd': f'{EMPER_ROOT}/build-vanilla/eval/io_latency --data iouring'
     },
+}
+
+EMPER_VARIANTS = {
     'vanilla': {},
+    'no-sleep': {},
     'pipe': {},
     'pipe-no-hint': {},
     'pipe-no-completer': {},