fix(perf_stress): Split stress multiplier by stress workload

Depend on stress workload, number of processes could give different
max throughput. Split stress multiplier on 3 w,r,m. This will allow
to configure different number of stress process on loader instance
for write, read, mixed independently.

(cherry picked from commit 2a5934e)

Author: aleksbykov

docs/configuration_options.md

@@ -237,9 +237,7 @@
 | **<a href="#user-content-stress_multiplier_w" name="stress_multiplier_w">stress_multiplier_w</a>**  | Number of cassandra-stress processes for write workload | 1 | SCT_STRESS_MULTIPLIER_W
 | **<a href="#user-content-stress_multiplier_r" name="stress_multiplier_r">stress_multiplier_r</a>**  | Number of cassandra-stress processes for read workload | 1 | SCT_STRESS_MULTIPLIER_R
 | **<a href="#user-content-stress_multiplier_m" name="stress_multiplier_m">stress_multiplier_m</a>**  | Number of cassandra-stress processes for mixed workload | 1 | SCT_STRESS_MULTIPLIER_M
-| **<a href="#user-content-run_fullscan" name="run_fullscan">run_fullscan</a>**  |  | N/A | SCT_RUN_FULLSCAN
-| **<a href="#user-content-run_full_partition_scan" name="run_full_partition_scan">run_full_partition_scan</a>**  | Runs a background thread that issues reversed-queries on a table random partition by an interval | N/A | SCT_run_full_partition_scan
-| **<a href="#user-content-run_tombstone_gc_verification" name="run_tombstone_gc_verification">run_tombstone_gc_verification</a>**  | Runs a background thread that verifies Tombstones GC on a table by an interval | N/A | SCT_RUN_TOMBSTONE_GC_VERIFICATION
+| **<a href="#user-content-run_fullscan" name="run_fullscan">run_fullscan</a>**  | A list of dictionaries describing the parameters for the fullscan operations to be run. Each dictionary describes a separate thread to be spawned. Possible modes include: "table" for regular full table scans, "partition" for fullscans targeting partitions, "aggregate" for aggregate operations and "random" for a random selection of the former modes. | N/A | SCT_RUN_FULLSCAN
 | **<a href="#user-content-keyspace_num" name="keyspace_num">keyspace_num</a>**  |  | 1 | SCT_KEYSPACE_NUM
 | **<a href="#user-content-round_robin" name="round_robin">round_robin</a>**  |  | N/A | SCT_ROUND_ROBIN
 | **<a href="#user-content-batch_size" name="batch_size">batch_size</a>**  |  | 1 | SCT_BATCH_SIZE

test-cases/performance/perf-regression.100threads.30M-keys.yaml

@@ -1,9 +1,9 @@
 test_duration: 300
 
-stress_cmd_w: "cassandra-stress write no-warmup cl=QUORUM duration=60m -schema 'replication(strategy=NetworkTopologyStrategy,replication_factor=3)' -mode cql3 native -rate threads=100 -pop seq=1..30000000"
-prepare_write_cmd: "cassandra-stress write no-warmup cl=QUORUM n=30000000 -schema 'replication(strategy=NetworkTopologyStrategy,replication_factor=3)' -mode cql3 native -rate threads=100 -pop seq=1..30000000"
-stress_cmd_r: "cassandra-stress read no-warmup cl=QUORUM duration=50m -schema 'replication(strategy=NetworkTopologyStrategy,replication_factor=3)' -mode cql3 native -rate threads=100 -pop 'dist=gauss(1..30000000,15000000,1500000)' "
-stress_cmd_m: "cassandra-stress mixed no-warmup cl=QUORUM duration=50m -schema 'replication(strategy=NetworkTopologyStrategy,replication_factor=3)' -mode cql3 native -rate threads=100 -pop 'dist=gauss(1..30000000,15000000,1500000)' "
+stress_cmd_w: "cassandra-stress write no-warmup cl=QUORUM duration=60m -schema 'replication(factor=3)' -mode cql3 native -rate threads=100 -pop seq=1..30000000"
+prepare_write_cmd: "cassandra-stress write no-warmup cl=QUORUM n=30000000 -schema 'replication(factor=3)' -mode cql3 native -rate threads=100 -pop seq=1..30000000"
+stress_cmd_r: "cassandra-stress read no-warmup cl=QUORUM duration=50m -schema 'replication(factor=3)' -mode cql3 native -rate threads=100 -pop 'dist=gauss(1..30000000,15000000,1500000)' "
+stress_cmd_m: "cassandra-stress mixed no-warmup cl=QUORUM duration=50m -schema 'replication(factor=3)' -mode cql3 native -rate threads=100 -pop 'dist=gauss(1..30000000,15000000,1500000)' "
 stress_multiplier_w: 2
 stress_multiplier_r: 2
 stress_multiplier_m: 2