asim: add heterogeneous_cpu test

Author: tbg

pkg/kv/kvserver/asim/tests/testdata/non_rand/heterogeneous_cpu

@@ -0,0 +1,53 @@
+skip_under_ci
+----
+
+gen_cluster nodes=3 node_cpu_rate_capacity=(8000000000,8000000000,16000000000)
+----
+
+gen_ranges ranges=200 min_key=1 max_key=10000 placement_type=even
+{s1,s2,s3}:1
+----
+
+# Read-only workload on first 30 ranges. 20 cores (out of 24 total in the cluster).
+# Because the ranges are placed evenly, initially each node will have about the same
+# cpu nanos per second.
+gen_load rate=40000 rw_ratio=1 request_cpu_per_access=500000 min_key=1 max_key=10000
+----
+
+# We want the CPU load to balance based on %cpu. But both the MMA and SMA balance
+# on absolute cpu-nanos, i.e. not taking into account that n3 has double the capacity.
+# See tracking issue: https://github.com/cockroachdb/cockroach/issues/153777
+assertion stat=cpu_util type=balance ticks=6 upper_bound=1.1
+----
+asserting: max_{stores}(cpu_util)/mean_{stores}(cpu_util) ≤ 1.10 at each of last 6 ticks
+
+eval cfgs=(sma-count,mma-only) duration=10m metrics=(cpu,cpu_util)
+----
+cpu#1: last:  [s1=6700914166, s2=6696073333, s3=6603012499] (stddev=45053658.00, mean=6666666666.00, sum=19999999998)
+cpu#1: thrash_pct: [s1=185%, s2=170%, s3=189%]  (sum=544%)
+cpu_util#1: last:  [s1=0.84, s2=0.84, s3=0.41] (stddev=0.20, mean=0.70, sum=2)
+cpu_util#1: thrash_pct: [s1=7%, s2=6%, s3=3%]  (sum=16%)
+artifacts[sma-count]: 3d4b1466c302acd1
+failed assertion sample 1
+  balance stat=cpu_util threshold=(≤1.10) ticks=6
+	max/mean=1.20 tick=0
+	max/mean=1.20 tick=1
+	max/mean=1.20 tick=2
+	max/mean=1.20 tick=3
+	max/mean=1.20 tick=4
+	max/mean=1.20 tick=5
+==========================
+cpu#1: last:  [s1=6400839999, s2=6398904166, s3=7199131191] (stddev=376775185.87, mean=6666291785.33, sum=19998875356)
+cpu#1: thrash_pct: [s1=34%, s2=30%, s3=37%]  (sum=102%)
+cpu_util#1: last:  [s1=0.80, s2=0.80, s3=0.45] (stddev=0.17, mean=0.68, sum=2)
+cpu_util#1: thrash_pct: [s1=8%, s2=7%, s3=4%]  (sum=20%)
+artifacts[mma-only]: 9d1c00f7d08f8c6d
+failed assertion sample 1
+  balance stat=cpu_util threshold=(≤1.10) ticks=6
+	max/mean=1.17 tick=0
+	max/mean=1.17 tick=1
+	max/mean=1.17 tick=2
+	max/mean=1.17 tick=3
+	max/mean=1.17 tick=4
+	max/mean=1.17 tick=5
+==========================