asim: change defaultRebalancingSnapshotRate to 32MiB/s

This commit updates defaultRebalancingSnapshotRate from 16MiB/s to 32MiB/s to
match with the default value of the kv.snapshot_rebalance.max_rate cluster
setting.

Epic: none
Release note: none

Author: wenyihu6

pkg/kv/kvserver/asim/config/settings.go

@@ -11,7 +11,7 @@ const (
 	defaultTickInteval             = 500 * time.Millisecond
 	defaultMetricsInterval         = 10 * time.Second
 	defaultReplicaChangeBaseDelay  = 100 * time.Millisecond
-	defaultRebalancingSnapshotRate = 16 << 20 // 16MiB/s
+	defaultRebalancingSnapshotRate = 32 << 20 // 32MiB/s
 	defaultSplitQueueDelay         = 100 * time.Millisecond
 	defaultRangeSizeSplitThreshold = 512 * 1024 * 1024 // 512mb
 	defaultRangeRebalanceThreshold = 0.05
@@ -57,8 +57,8 @@ type SimulationSettings struct {
 	// movement.
 	ReplicaChangeBaseDelay time.Duration
 	// RebalancingSnapshotRate is rate at which newly added replicas will be
-	// added based on the range size. e.g., When the range size is 16MB, and the
-	// RebalancingSnapshotRate is 16 << 20, the delay for adding a replica wil be
+	// added based on the range size. e.g., When the range size is 32MiB, and the
+	// RebalancingSnapshotRate is 32 << 20, the delay for adding a replica wil be
 	// 1 second + ReplicaChangeBaseDelay.
 	RebalancingSnapshotRate int64
 	// SplitQueueDelay is the delay that range splits take to complete.

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

@@ -37,16 +37,16 @@ plot stat=replicas sample=1
 ----
  301 ┼──────────────────────────────────────╭────────────────────────────────────────
  281 ┤                                   ╭──╯
- 261 ┤                                 ╭─╯╯
- 241 ┤                              ╭──╯
- 221 ┤                           ╭╭─╯╯
- 201 ┤                         ╭──╯
- 181 ┤                      ╭──╯
- 161 ┤                    ╭─╯╯
- 140 ┤                 ╭╭─╯
- 120 ┤              ╭╭──╯
- 100 ┤            ╭──╯
-  80 ┤         ╭──╯
+ 261 ┤                                ╭──╯╯
+ 241 ┤                             ╭──╯╯
+ 221 ┤                          ╭──╯─╯
+ 201 ┤                        ╭─╯─╯
+ 181 ┤                      ╭─╯─╯
+ 161 ┤                   ╭──╯╯
+ 140 ┤                 ╭─╯╯
+ 120 ┤              ╭──╯
+ 100 ┤           ╭──╯
+  80 ┤         ╭─╯╯
   60 ┤      ╭╭─╯
   40 ┤    ╭──╯
   20 ┤ ╭──╯

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

@@ -19,46 +19,46 @@ OK
 # store 5. This is shown below as it sheds replicas.
 plot stat=replicas
 ----
- 345 ┤                                                    ╭╮               ╭╮
- 334 ┤                      ╭─╮ ╭╮         ╭╮╭─╮╭╮╭╮╭╮╭─╭╮╯│     ╭─╭╮╭╮  ╭╮╯│╭─╭─╮╮─╭
- 324 ┤             ╭╮╭─╮ ╭╭─│─│╭╯╭─╮╭─╭──╮╭╮╭─╮│╯╭╯╰╮╰╮╭╯│╮╰╮╭─╮╭╯╭╯╰╮─╮╭╯╰╮─╯╭│╯╰╮╮╭
- 313 ┤           ╭╮╯╭╭─╮╭───╯ ╰╮╰│╮│╯╭│╮╯╰──╯╯╰╮╭╯╭╯│╯╭╯╭╰╮╮╭╯ │╯││││││╭╯╮╰│ ╭╭╯│╭│╭╯
- 303 ┤╭──────────╯╰╮╭╯│╰╯╭╯│╰─╯│╭╯│╰╮╭╯╰─╯│  ╰╯╰╯╭╯ │╭╯─╯││╭╯╮╭│╰╭╯─╰╰─╯ ╰╯│─╭╯╯╰╯╰╯
- 292 ┼─╮────────────╯ ╰╯╰╯╰│╭╯ ││ ╰─╰╯╰──╯╰╮╭╯  ││  ╰╯   ╰╰╯ ╰╯╰─╯╯    │╭╯ ╰─╯
- 282 ┤ ╰─────────╮         ╰╯  ╰╯          ╰╯   ╰╯                     ╰╯
- 271 ┤           │╭─╮
- 261 ┤           ╰╯ │  ╭╮                                              ╭╮
- 250 ┤              ╰╮╭╯╰╮ ╭╮  ╭╮  ╭╮ ╭─╮  ╭╮              ╭╮   ╭─╮   ╭╯│   ╭╮
- 240 ┤               ││  │╭╯╰╮╭╯│ ╭╯╰╮│ ╰╮ │╰╮  ╭╮   ╭╮   ╭╯╰╮  │ │  ╭╯ ╰╮  ││
- 229 ┤               ╰╯  ╰╯  ││ ╰╮│  ╰╯  │╭╯ │  ││   │╰╮  │  ╰╮╭╯ ╰╮ │   │ ╭╯╰╮
- 219 ┤                       ╰╯  ╰╯      ╰╯  ╰╮╭╯╰╮ ╭╯ │ ╭╯   ││   │╭╯   ╰╮│  ╰╮   ╭╮
- 208 ┤                                        ││  │ │  ╰╮│    ╰╯   ╰╯     ╰╯   │  ╭╯│
- 198 ┤                                        ╰╯  ╰─╯   ╰╯                     ╰╮ │ ╰
- 187 ┤                                                                          ╰─╯
+ 340 ┤                                                                     ╭╮     ╭╮╭
+ 329 ┤                                    ╭╭─╭──╮╭─╮╭─╮╭─╭╮╭╭╮  ╭╮ ╭╮╮╭╭─╮─╭╭╮─╭╭╮╯╭╯
+ 319 ┤                 ╭╮ ╭╮  ╭╮╭╭╮╭╮ ╭╮╭────╯─╯╰╯╭╰──────╮╭╯│─╭╯│╭╯╰╮╭╯╰│─╭╯│─╭╯╰─╯─
+ 308 ┤                ╭╭──╮╭╭────╯╰╮╭─╯╰╯╰╯ ╰╯   ╰╯ ╰─╰─╯╰╰╯╯╰─╯╰╰╯  ╰╯─╯╰─╯╰╰─╯╰╯  ╰
+ 297 ┼╮────────────────╯╭╯╰╭╮─╯╯╯╰╯╰╯││
+ 286 ┤╰───────────────╮╰╯  ││        ╰╯
+ 276 ┤                │╭─╮╭╯╰╮
+ 265 ┤                ╰╯ ╰╯  │╭─╮ ╭╮ ╭╮
+ 254 ┤                       ╰╯ │ ││ ││
+ 243 ┤                          ╰─╯╰─╯╰╮
+ 233 ┤                                 │                  ╭╮  ╭╮
+ 222 ┤                                 ╰──╮           ╭╮  │╰╮╭╯│ ╭╮
+ 211 ┤                                    │ ╭─╮     ╭╮│╰╮╭╯ ││ ╰─╯│  ╭╮             ╭
+ 200 ┤                                    ╰╮│ │  ╭╮ │╰╯ ╰╯  ╰╯    ╰╮ │╰╮ ╭─╮╭──╮╭─╮ │
+ 190 ┤                                     ╰╯ ╰╮╭╯╰─╯              ╰─╯ │ │ ││  ││ ╰─╯
+ 179 ┤                                         ╰╯                      ╰─╯ ╰╯  ╰╯
                                           replicas
 initial store values: [s1=300, s2=300, s3=300, s4=300, s5=300] (stddev=0.00, mean=300.00, sum=1500)
-last store values: [s1=321, s2=337, s3=323, s4=324, s5=201] (stddev=50.42, mean=301.20, sum=1506)
+last store values: [s1=313, s2=334, s3=317, s4=340, s5=211] (stddev=47.10, mean=303.00, sum=1515)
 
 # Plot the % of disk storage capacity used. We should see s5 hovering right
 # around 92.5-95% (the storage capacity threshold value).
 plot stat=disk_fraction_used
 ----
- 1.14 ┤                                                                      ╭─╮
- 1.06 ┤                                     ╭╮              ╭╮         ╭─╮   │ │    ╭╮
- 0.99 ┤         ╭─╮╭─╮  ╭╮ ╭─╮ ╭─╮ ╭─╮ ╭─╮  │╰╮ ╭──╮  ╭─╮  ╭╯╰╮  ╭─╮   │ ╰╮ ╭╯ ╰╮  ╭╯╰
- 0.91 ┤   ╭─────╯ ╰╯ ╰╮╭╯╰─╯ ╰─╯ ╰╮│ ╰─╯ ╰╮╭╯ ╰╮│  ╰╮╭╯ │ ╭╯  ╰╮╭╯ ╰╮ ╭╯  ╰╮│   ╰──╯
- 0.84 ┼─╮╭╯           ╰╯          ╰╯      ╰╯   ╰╯   ╰╯  ╰─╯    ╰╯   ╰─╯    ╰╯
- 0.76 ┤ ╰╯
- 0.68 ┤
- 0.61 ┤
- 0.53 ┤
- 0.46 ┤
- 0.38 ┤
- 0.30 ┤
- 0.23 ┤
+ 1.09 ┤                                                        ╭╮ ╭╮
+ 1.02 ┤                     ╭─╮╭╮     ╭─╮ ╭╮ ╭─╮       ╭╮  ╭╮  ││ │╰╮ ╭╮  ╭─╮ ╭╮  ╭╮
+ 0.95 ┤          ╭────────╮ │ ││╰───╮╭╯ ╰─╯╰╮│ ╰╮╭─╮ ╭╮│╰╮╭╯╰╮╭╯│╭╯ │ │╰╮ │ │╭╯╰╮╭╯╰╮╭
+ 0.87 ┤ ╭────────╯        ╰─╯ ╰╯    ╰╯      ╰╯  ╰╯ ╰─╯╰╯ ╰╯  ╰╯ ╰╯  ╰─╯ ╰─╯ ╰╯  ╰╯  ╰╯
+ 0.80 ┼─╯
+ 0.73 ┤
+ 0.66 ┤
+ 0.58 ┤
+ 0.51 ┤
+ 0.44 ┤
+ 0.36 ┤
+ 0.29 ┤
+ 0.22 ┤
  0.15 ┤
- 0.08 ┤
+ 0.07 ┤
  0.00 ┼───────────────────────────────────────────────────────────────────────────────
                                       disk_fraction_used
 initial store values: [s1=0.00, s2=0.00, s3=0.00, s4=0.00, s5=0.83] (stddev=0.33, mean=0.17, sum=1)
-last store values: [s1=0.00, s2=0.00, s3=0.00, s4=0.00, s5=1.02] (stddev=0.41, mean=0.20, sum=1)
+last store values: [s1=0.00, s2=0.00, s3=0.00, s4=0.00, s5=0.97] (stddev=0.39, mean=0.19, sum=1)