simple perf stats for state sim (#148)

research/state_sim.nim

@@ -1,19 +1,45 @@
 import
-  confutils,
+  confutils, stats, times,
   json, strformat,
   options, sequtils, random,
   ../tests/[testutil],
   ../beacon_chain/spec/[beaconstate, crypto, datatypes, digest, helpers, validator],
   ../beacon_chain/[attestation_pool, extras, ssz, state_transition, fork_choice]
 
-proc `%`(v: uint64): JsonNode = newJInt(v.BiggestInt)
+proc `%`(v: uint64): JsonNode =
+  if v > uint64(high(BiggestInt)): newJString($v) else: newJInt(BiggestInt(v))
 proc `%`(v: Eth2Digest): JsonNode = newJString($v)
 proc `%`(v: ValidatorSig|ValidatorPubKey): JsonNode = newJString($v)
 
+type Timers = enum
+  tBlock = "Process non-epoch slot with block"
+  tEpoch = "Proces epoch slot with block"
+  tHashBlock = "Tree-hash block"
+  tShuffle = "Retrieve committe once using get_crosslink_committees_at_slot"
+  tAttest = "Combine committee attestations"
+
+template withTimer(stats: var RunningStat, body: untyped) =
+  let start = cpuTime()
+
+  block:
+    body
+
+  let stop = cpuTime()
+  stats.push stop - start
+
+template withTimerRet(stats: var RunningStat, body: untyped): untyped =
+  let start = cpuTime()
+  let tmp = block:
+    body
+  let stop = cpuTime()
+  stats.push stop - start
+
+  tmp
+
 proc writeJson*(prefix, slot, v: auto) =
   var f: File
   defer: close(f)
-  discard open(f, fmt"{prefix:04}-{slot:08}.json", fmWrite)
+  discard open(f, fmt"{prefix:04}-{humaneSlotNum(slot):08}.json", fmWrite)
   write(f, pretty(%*(v)))
 
 cli do(slots = 1945,
@@ -32,35 +58,51 @@ cli do(slots = 1945,
     attestations: array[MIN_ATTESTATION_INCLUSION_DELAY, seq[Attestation]]
     state = genesisState
     latest_block_root = hash_tree_root_final(genesisBlock)
+    timers: array[Timers, RunningStat]
+    attesters: RunningStat
+    r: Rand
+    blck: BeaconBlock
 
-  var r: Rand
+  proc maybeWrite() =
-  for i in 0..<slots:
     if state.slot mod json_interval.uint64 == 0:
       writeJson(prefix, state.slot, state)
       write(stdout, ":")
     else:
       write(stdout, ".")
 
+  for i in 0..<slots:
+    maybeWrite()
+
     let
       attestations_idx = state.slot mod MIN_ATTESTATION_INCLUSION_DELAY
       body = BeaconBlockBody(attestations: attestations[attestations_idx])
 
     attestations[attestations_idx] = @[]
 
-    latest_block_root = hash_tree_root_final(
+    let t =
-      addBlock(state, latest_block_root, body, flags))
+      if (state.slot + 2.Slot) mod SLOTS_PER_EPOCH == 0: tEpoch
+      else: tBlock
+
+    withTimer(timers[t]):
+      blck = addBlock(state, latest_block_root, body, flags)
+    latest_block_root = withTimerRet(timers[tHashBlock]):
+      hash_tree_root_final(blck)
 
     if attesterRatio > 0.0:
       # attesterRatio is the fraction of attesters that actually do their
       # work for every slot - we'll randimize it deterministically to give
       # some variation
-      let scass = get_crosslink_committees_at_slot(state, state.slot)
+      let scass = withTimerRet(timers[tShuffle]):
+        get_crosslink_committees_at_slot(state, state.slot)
 
       for scas in scass:
         var
           attestation: Attestation
           first = true
 
+        attesters.push scas.committee.len()
+
+        withTimer(timers[tAttest]):
           for v in scas.committee:
             if (rand(r, high(int)).float * attesterRatio).int <= high(int):
               if first:
@@ -80,5 +122,23 @@ cli do(slots = 1945,
 
     flushFile(stdout)
 
+    if (state.slot) mod SLOTS_PER_EPOCH == 0:
+      echo &" slot: {humaneSlotNum(state.slot)} ",
+        &"epoch: {humaneEpochNum(state.slot.slot_to_epoch)}"
+
+  maybeWrite() # catch that last state as well..
+
   echo "done!"
 
+  echo "Validators: ", validators, ", epoch length: ", SLOTS_PER_EPOCH
+  echo "Validators per attestation (mean): ", attesters.mean
+
+  proc fmtTime(t: float): string = &"{t * 1000 :>12.3f}, "
+
+  echo "All time are ms"
+  echo &"{\"Average\" :>12}, {\"StdDev\" :>12}, {\"Min\" :>12}, " &
+    &"{\"Max\" :>12}, {\"Samples\" :>12}, {\"Test\" :>12}"
+  for t in Timers:
+    echo fmtTime(timers[t].mean), fmtTime(timers[t].standardDeviationS),
+      fmtTime(timers[t].min), fmtTime(timers[t].max), &"{timers[t].n :>12}, ",
+      $t