DHT Sync Lag

Measure lag time between an agent publishing data and other peers being able to see it. This scenario has two roles:

  • write: A simple job that just creates entries with a timestamp field. Those entries are linked to a known base hash. For each write, the metric ws.custom.dht_sync_sent_count is incremented.
  • record_lag: A job that repeatedly queries for links from the known base hash. It keeps track of records that it has seen and when a new record is found, and calculates the time difference between the timestamp of the new record and the current time. That time difference is then recorded as a custom metric called wt.custom.dht_sync_lag.

After each behaviour loop the metric ws.custom.dht_sync_recv_count is incremented.

Started
Tue, 14 Apr 2026 12:21:42 UTC
Peer count
250
Peer count at end
62500
Behaviours
  • record_lag (1 agent)
  • write (1 agent)
Holochain version
0.6.1-rc.4
Wind Tunnel version
0.6.0
Run ID
dht_sync_lag_24397616982_1
Create rate
The average number of created records per agent.
Mean
mean
34.45
/s
Max
Highest per-partition mean rate
max
119.14
/s
Min
Lowest per-partition mean rate
min
10.2
/s
Sync lag timing
The average time between when a record was created and when it is first seen by an agent.
Mean
mean
199.306291
s
SD
111.639163
s
Max
Highest per-partition mean latency
max mean
1110.374264
s
Min
Lowest per-partition mean latency
min mean
22.652776
s
Sync lag rate
The average number of created records discovered per agent.
Mean
mean
87.91
/s
Max
Highest per-partition mean rate
max
630
/s
Min
Lowest per-partition mean rate
min
0
/s
Error count
The number of errors encountered during the scenario.
664
Holochain Metrics
Hidden by default. Click to toggle visibility.
Cascade duration
Time taken to execute a cascade (get) query inside Holochain.
mean
0.030004
s
SD
0.06356
s
p50
0.020208
s
<
p95
0.178252
s
<
p99
0.326774
s
Cascade fetch errors
Count of network fetch errors during cascade calls.
total
3
over 5389.381572313s
mean rate
554.81
/s
std
15601.43
/s
p5
0
/s
p95
773.51
/s
peak
1.30042633e+06
/s
WASM usage: 'timed::created_timed_entry'
Metered usage count of the WASM ribosome for this zome function.
total
649261388
over 19355.402936616s
mean rate
2.11179679855e+10
/s
std
2.6694536845e+11
/s
p5
2.948898144e+07
/s
p95
6.23618805058e+10
/s
peak
3.08572792079e+13
/s
WASM usage: 'timed::get_timed_entries_local'
Metered usage count of the WASM ribosome for this zome function.
total
6201478811
over 2009.221761539s
mean rate
1.59876263834e+10
/s
std
5.9144814997e+10
/s
p5
1.0866809833e+08
/s
p95
6.5542489705e+10
/s
peak
1.28155740142e+12
/s
WASM usage: 'timed_integrity::entry_defs'
Metered usage count of the WASM ribosome for this zome function.
total
73459024
over 19355.402936616s
mean rate
3.02852404942e+09
/s
std
3.71646079605e+10
/s
p5
4.10192333e+06
/s
p95
8.53143807284e+09
/s
peak
3.49170693069e+12
/s
Zome call duration: 'timed::created_timed_entry'
Duration of this zome call as measured by Holochain internally.
mean
0.021013
s
SD
0.011107
s
p50
0.021362
s
<
p95
0.04175
s
<
p99
0.064062
s
Zome call duration: 'timed::get_timed_entries_local'
Duration of this zome call as measured by Holochain internally.
mean
0.20546
s
SD
0.887705
s
p50
0.264199
s
<
p95
1.67375
s
<
p99
4.962116
s
WASM call duration: 'timed::created_timed_entry'
Duration of inner WASM calls for this function, excluding Holochain overhead.
mean
0.018645
s
SD
0.010541
s
p50
0.018527
s
<
p95
0.038246
s
<
p99
0.061062
s
WASM call duration: 'timed::get_timed_entries_local'
Duration of inner WASM calls for this function, excluding Holochain overhead.
mean
0.203839
s
SD
0.887511
s
p50
0.262504
s
<
p95
1.670805
s
<
p99
4.959518
s
WASM call duration: 'timed_integrity::entry_defs'
Duration of inner WASM calls for this function, excluding Holochain overhead.
mean
0.002182
s
SD
0.000735
s
p50
0.002374
s
<
p95
0.003517
s
<
p99
0.004043
s
Host function call duration: '__hc__create_1'
Duration of this host function call invoked from within WASM.
mean
0.003528
s
SD
0.004014
s
p50
0.002596
s
<
p95
0.011065
s
<
p99
0.022509
s
Host function call duration: '__hc__create_link_1'
Duration of this host function call invoked from within WASM.
mean
0.00348
s
SD
0.004006
s
p50
0.002646
s
<
p95
0.010471
s
<
p99
0.023241
s
Host function call duration: '__hc__get_1'
Duration of this host function call invoked from within WASM.
mean
0.032064
s
SD
0.071786
s
p50
0.023289
s
<
p95
0.20293
s
<
p99
0.359977
s
Host function call duration: '__hc__get_links_1'
Duration of this host function call invoked from within WASM.
mean
0.007891
s
SD
0.011277
s
p50
0.008299
s
<
p95
0.033647
s
<
p99
0.057777
s
Host function call duration: '__hc__zome_info_1'
Duration of this host function call invoked from within WASM.
mean
0.004383
s
SD
0.001666
s
p50
0.00479
s
<
p95
0.007428
s
<
p99
0.008677
s
Post-commit duration
Time spent executing post-commit workflows.
mean
0.001452
s
SD
0.000772
s
p50
0.001405
s
<
p95
0.002757
s
<
p99
0.003763
s
Conductor uptime
Conductor uptime gauge. A drop in the trend indicates a restart during the run.
p5
88.54
s
<
mean
913.39
s
SD
529.68
s
<
p95
1745.27
s
Integrated ops
Count of DHT ops integrated since the conductor started. Resets on restart.
total
47714
over 19355.402898643s
mean rate
3.46323942e+06
/s
std
7.22044883e+07
/s
p5
3864.98
/s
p95
8.1982734e+06
/s
peak
7.85794261721e+09
/s
Integration delay
Delay between an op being stored and being integrated. High values indicate the pipeline is falling behind.
mean
111.097244
s
SD
102.249421
s
p50
74.028856
s
<
p95
284.395698
s
<
p99
511.423284
s
Validation attempts per op
Number of validation attempts required per op. Values consistently above 1 indicate retries.
mean
1.366391
s
SD
0.284761
s
p50
1.330923
s
<
p95
2.002518
s
<
p99
2.022996
s
App validation workflow duration
Time spent running the app validation workflow.
mean
11.242554
s
SD
31.875219
s
p50
32.407548
s
<
p95
93.102514
s
<
p99
125.60055
s
Countersigning workflow duration
Time spent running the countersigning workflow.
mean
0.004587
s
SD
0.003991
s
p50
0.003822
s
<
p95
0.00993
s
<
p99
0.024104
s
Integrate DHT ops workflow duration
Time spent running the integration workflow.
mean
0.055464
s
SD
1.998608
s
p50
0.050239
s
<
p95
0.265424
s
<
p99
12.759118
s
Publish DHT ops workflow duration
Time spent running the publish workflow.
mean
0.896983
s
SD
3.862936
s
p50
0.153755
s
<
p95
10.765606
s
<
p99
16.604104
s
System validation workflow duration
Time spent running the sys validation workflow.
mean
12.958663
s
SD
69.111785
s
p50
57.0816
s
<
p95
214.266263
s
<
p99
286.916129
s
Validation receipt workflow duration
Time spent running the validation receipt workflow.
mean
0.566223
s
SD
37.27578
s
p50
0.52934
s
<
p95
60.957641
s
<
p99
198.938477
s
Authored DB connection use time
Time spent holding authored database connections.
mean
0.013941
s
SD
0.013471
s
p50
0.009524
s
<
p95
0.030618
s
<
p99
0.079776
s
DHT DB connection use time
Time spent holding DHT database connections.
mean
0.003229
s
SD
0.003296
s
p50
0.00316
s
<
p95
0.008656
s
<
p99
0.018717
s
Conductor DB connection use time
Time spent holding conductor database connections.
mean
0.000429
s
SD
0.000218
s
p50
0.000435
s
<
p95
0.00077
s
<
p99
0.001043
s
Cache DB connection use time
Time spent holding cache database connections.
mean
0.010765
s
SD
0.013912
s
p50
0.000305
s
<
p95
0.029132
s
<
p99
0.077565
s
WASM DB connection use time
Time spent holding WASM database connections.
mean
0.00026
s
SD
0.000187
s
p50
0.00025
s
<
p95
0.000428
s
<
p99
0.00067
s
Peer meta store DB connection use time
Time spent holding peer meta store database connections.
mean
0.000179
s
SD
6.9e-05
s
p50
0.000207
s
<
p95
0.000311
s
<
p99
0.000372
s
Write transaction duration
Duration of exclusive write transactions across all databases.
mean
0.00858
s
SD
0.10957
s
p50
0.005246
s
<
p95
0.29833
s
<
p99
0.412314
s
Lair keystore: signing
Duration of Ed25519 signing requests to the Lair keystore.
mean
0.001756
s
SD
0.003622
s
p50
0.001814
s
<
p95
0.009819
s
<
p99
0.020416
s
P2P request roundtrip: 'get'
Time spent sending a get request and awaiting its response.
mean
1.979898
s
SD
29.798247
s
p50
3.151493
s
<
p95
61.715597
s
<
p99
67.40421
s
P2P request roundtrip: 'send_validation_receipts'
Time spent sending a send_validation_receipts request and awaiting its response.
mean
1.220309
s
SD
27.405469
s
p50
1.93503
s
<
p95
60.017615
s
<
p99
60.061354
s
Host Metrics
User CPU usage
CPU usage by user space
45.13
%
Network receive rate (primary)
Rate of bytes received on primary network interface
p5
884
B/s
<
mean
883.49
KiB/s
SD
794.31
KiB/s
<
p95
2.36
MiB/s
Network send rate (primary)
Rate of bytes sent on primary network interface
p5
165
B/s
<
mean
133.26
KiB/s
SD
357.80
KiB/s
<
p95
345.95
KiB/s
Total bytes received
Total bytes received on primary network interface
count
410.84
GiB
mean
21.73
MiB/s
Total bytes sent
Total bytes sent on primary network interface
count
61.92
GiB
mean
3.28
MiB/s
CPU spike anomaly
CPU spike anomaly was detected
Detected

Warning CPU p99 reached 96.4%

Memory leak anomaly
Memory leak anomaly was detected
Detected

Warning Memory growing at 843.02 MiB/s

Disk full anomaly
Disk full anomaly was detected
NotDetected
Swap thrashing anomaly
Swap thrashing anomaly was detected
NotDetected
System overload anomaly
System overload anomaly was detected
Detected

Warning 83% of hosts overloaded (load5/ncpus > 1.0)

Additional Host Metrics
Hidden by default. Click to toggle visibility.
CPU usage
Total CPU usage and kernel CPU usage
Total
p5
1.1
%
<
mean
61.46
%
SD
26.43
%
<
p95
90.13
%
System
16.33
%
CPU percentiles
CPU usage percentiles
p50
69.69
%
p95
90.13
%
p99
96.37
%
CPU usage above 80%
Number of hosts above 80% CPU and mean time spent above threshold for those hosts
count
227
hosts
mean time
0.28
s
Memory used percentage
Percentage of memory used
p5
7.28
%
<
mean
10.52
%
SD
4.73
%
<
p95
14.52
%
Memory available percentage
Percentage of available memory
p5
85.48
%
<
mean
89.48
%
SD
4.73
%
<
p95
92.72
%
Max host memory used
Maximum memory usage percentage across all hosts
max
79.81
%
Max host swap used percentage
Maximum swap space usage percentage across all hosts
max
0.14
%
Memory growth rate
Rate of memory growth over time
growth
843.02
MiB/s
Disk read throughput
Disk read throughput in MiB/s
2.36
MiB/s
Disk write throughput
Disk write throughput in MiB/s
290.86
MiB/s
Disk space utilization risk
Number of hosts nearing disk space capacity by mount point
Mount Point /
0/218
hosts
Mount Point /efi-boot
0/6
hosts
Mount Point /etc/hostname
0/8
hosts
Mount Point /etc/hosts
0/8
hosts
Mount Point /etc/resolv.conf
0/8
hosts
Mount Point /nix/store
0/8
hosts
System load average
System load averages over 1, 5, and 15 minutes. This is an unnormalised value not divided by number of CPUs, so it is only meaningful if all machines have the same core count.
1 min
2.78
5 min
2.39
15 min
1.61
CPU overloaded hosts
Percentage of hosts that experienced CPU overload
82.77
%
CPU pressure
CPU pressure over 10, 60, and 300 second averages
10 second average
p5
0
%
<
mean
33.6798
%
SD
21.5281
%
<
p95
70.31
%
60 second average
32.9086
%
300 second average
28.2192
%
Memory pressure some
Memory pressure (some tasks stalled) over 10, 60, and 300 second averages
10 second average
p5
0
%
≤
mean
0
%
SD
0
%
≤
p95
0
%
60 second average
0.0000
%
300 second average
0.0000
%
Memory pressure full
Memory pressure (all tasks stalled) over 10, 60, and 300 second averages
10 second average
p5
0
%
≤
mean
0
%
SD
0
%
≤
p95
0
%
60 second average
0.0000
%
300 second average
0.0000
%
I/O pressure some
I/O pressure (some tasks stalled) over 10, 60 and 300 second averages
10 second average
p5
0
%
<
mean
8.4738
%
SD
8.2111
%
<
p95
20.1
%
60 second average
8.3405
%
300 second average
7.2477
%
I/O pressure full
I/O pressure (all tasks stalled) over 10, 60 and 300 second averages
10 second average
p5
0
%
<
mean
4.985
%
SD
6.6241
%
<
p95
14.21
%
60 second average
4.8993
%
300 second average
4.2771
%
Holochain process CPU usage
CPU usage by Holochain process
p5
0
%
<
mean
60.1
%
SD
23.4
%
<
p95
86.25
%
Holochain process memory (PSS)
Proportional Set Size memory of Holochain process
p5
234.23
KiB
<
mean
354.72
KiB
SD
102.08
KiB
<
p95
498.92
KiB
Holochain process threads
Number of threads in Holochain process
p5
5
threads
<
mean
27.17
threads
SD
12.15
threads
<
p95
48
threads
Holochain process file descriptors
Number of file descriptors used by Holochain process
p5
32
file descriptors
<
mean
74.75
file descriptors
SD
15.66
file descriptors
<
p95
94
file descriptors