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
Mon, 30 Mar 2026 22:13:10 UTC
Peer count
22
Peer count at end
484
Behaviours
  • record_lag (1 agent)
  • write (1 agent)
Holochain version
0.6.1-rc.3
Wind Tunnel version
0.6.0
Run ID
dht_sync_lag_23770227011
Create rate
The average number of created records per agent.
Mean
mean
33.21
/s
Max
Highest per-partition mean rate
max
81.16
/s
Min
Lowest per-partition mean rate
min
8.72
/s
Sync lag timing
The average time between when a record was created and when it is first seen by an agent.
Mean
mean
536.706625
s
SD
414.833889
s
Max
Highest per-partition mean latency
max mean
706.420388
s
Min
Lowest per-partition mean latency
min mean
334.061658
s
Sync lag rate
The average number of created records discovered per agent.
Mean
mean
54.95
/s
Max
Highest per-partition mean rate
max
165.62
/s
Min
Lowest per-partition mean rate
min
15.68
/s
Error count
The number of errors encountered during the scenario.
23
Host Metrics
User CPU usage
CPU usage by user space
32.79
%
Network receive rate (primary)
Rate of bytes received on primary network interface
p5
76.15
KiB/s
<
mean
485.84
KiB/s
SD
438.17
KiB/s
<
p95
1.15
MiB/s
Network send rate (primary)
Rate of bytes sent on primary network interface
p5
37.89
KiB/s
<
mean
478.58
KiB/s
SD
594.74
KiB/s
<
p95
1.71
MiB/s
Total bytes received
Total bytes received on primary network interface
count
18.48
GiB
mean
10.23
MiB/s
Total bytes sent
Total bytes sent on primary network interface
count
18.20
GiB
mean
10.07
MiB/s
CPU spike anomaly
CPU spike anomaly was detected
NotDetected
Memory leak anomaly
Memory leak anomaly was detected
Detected

Warning Memory growing at 362.58 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
NotDetected
Additional Host Metrics
Hidden by default. Click to toggle visibility.
CPU usage
Total CPU usage and kernel CPU usage
Total
p5
15.6
%
<
mean
38.67
%
SD
15.01
%
<
p95
67.84
%
System
5.88
%
CPU percentiles
CPU usage percentiles
p50
35.89
%
p95
67.84
%
p99
81.43
%
CPU usage above 80%
Number of hosts above 80% CPU and mean time spent above threshold for those hosts
count
10
hosts
mean time
0.03
s
Memory used percentage
Percentage of memory used
p5
8.01
%
<
mean
13.22
%
SD
2.87
%
<
p95
19.25
%
Memory available percentage
Percentage of available memory
p5
80.75
%
<
mean
86.78
%
SD
2.87
%
<
p95
91.99
%
Max host memory used
Maximum memory usage percentage across all hosts
max
17.34
%
Max host swap used percentage
Maximum swap space usage percentage across all hosts
max
0.01
%
Memory growth rate
Rate of memory growth over time
growth
362.58
MiB/s
Disk read throughput
Disk read throughput in MiB/s
5.98
MiB/s
Disk write throughput
Disk write throughput in MiB/s
194.35
MiB/s
Disk space utilization risk
Number of hosts nearing disk space capacity by mount point
Mount Point /
0/22
hosts
Mount Point /efi-boot
0/20
hosts
Mount Point /nix/store
0/22
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
3.74
5 min
3.25
15 min
2.20
CPU overloaded hosts
Percentage of hosts that experienced CPU overload
0.00
%
CPU pressure
CPU pressure over 10, 60, and 300 second averages
10 second average
p5
0.14
%
<
mean
5.9776
%
SD
7.1917
%
<
p95
19.27
%
60 second average
5.8897
%
300 second average
5.2165
%
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
0.51
%
<
mean
27.0796
%
SD
12.4459
%
<
p95
45.91
%
60 second average
26.4582
%
300 second average
23.0184
%
I/O pressure full
I/O pressure (all tasks stalled) over 10, 60 and 300 second averages
10 second average
p5
0.27
%
<
mean
18.9374
%
SD
10.1136
%
<
p95
36.22
%
60 second average
18.4713
%
300 second average
16.0548
%
Holochain process CPU usage
CPU usage by Holochain process
p5
0.57
%
<
mean
31.15
%
SD
16.88
%
<
p95
60.06
%
Holochain process memory (PSS)
Proportional Set Size memory of Holochain process
p5
180.31
KiB
<
mean
368.73
KiB
SD
104.85
KiB
<
p95
553.77
KiB
Holochain process threads
Number of threads in Holochain process
p5
17
threads
<
mean
37.29
threads
SD
10.55
threads
<
p95
52
threads
Holochain process file descriptors
Number of file descriptors used by Holochain process
p5
52
file descriptors
<
mean
82.66
file descriptors
SD
15.82
file descriptors
<
p95
107
file descriptors

Remote Signals

This scenario tests the throughput of remote_signals operations.

Started
Mon, 30 Mar 2026 22:15:03 UTC
Peer count
10
Peer count at end
50
Behaviours
  • default (1 agent)
Holochain version
0.6.1-rc.3
Wind Tunnel version
0.6.0
Run ID
remote_signals_23770227011
Round trip time
The time from origin signal dispatch to origin receive of the remote side's response signal.
mean
0.140636
s
SD
0.398402
s
p50
0.094853
s
<
p95
0.2863
s
<
p99
2.043139
s
Timeouts
The number of timeouts waiting for the remote side's response signal (default timeout is 20 seconds).
map[count:6 mean_rate_per_second:29240.22 measurement_duration:map[nanos:479015652 secs:14] p5_rate_per_second:0 p95_rate_per_second:350877.19 peak_rate_per_second:350877.19 rate_trend:map[trend:[116959.31 0.52] window_duration:10s] std_rate_per_second:96977.2]
Host Metrics
User CPU usage
CPU usage by user space
29.36
%
Network receive rate (primary)
Rate of bytes received on primary network interface
p5
207.65
KiB/s
<
mean
539.29
KiB/s
SD
325.86
KiB/s
<
p95
1.14
MiB/s
Network send rate (primary)
Rate of bytes sent on primary network interface
p5
95.43
KiB/s
<
mean
501.67
KiB/s
SD
410.17
KiB/s
<
p95
1.35
MiB/s
Total bytes received
Total bytes received on primary network interface
count
2.36
GiB
mean
2.59
MiB/s
Total bytes sent
Total bytes sent on primary network interface
count
2.19
GiB
mean
2.41
MiB/s
CPU spike anomaly
CPU spike anomaly was detected
NotDetected
Memory leak anomaly
Memory leak anomaly was detected
Detected

Warning Memory growing at 184.86 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
NotDetected
Additional Host Metrics
Hidden by default. Click to toggle visibility.
CPU usage
Total CPU usage and kernel CPU usage
Total
p5
13.92
%
<
mean
36.97
%
SD
16.23
%
<
p95
64.11
%
System
7.61
%
CPU percentiles
CPU usage percentiles
p50
35.40
%
p95
64.11
%
p99
77.14
%
CPU usage above 80%
Number of hosts above 80% CPU and mean time spent above threshold for those hosts
count
3
hosts
mean time
0.01
s
Memory used percentage
Percentage of memory used
p5
9.97
%
<
mean
17.33
%
SD
3.81
%
<
p95
20.12
%
Memory available percentage
Percentage of available memory
p5
79.88
%
<
mean
82.67
%
SD
3.81
%
<
p95
90.03
%
Max host memory used
Maximum memory usage percentage across all hosts
max
19.79
%
Max host swap used percentage
Maximum swap space usage percentage across all hosts
max
0.00
%
Memory growth rate
Rate of memory growth over time
growth
184.86
MiB/s
Disk read throughput
Disk read throughput in MiB/s
0.00
MiB/s
Disk write throughput
Disk write throughput in MiB/s
27.80
MiB/s
Disk space utilization risk
Number of hosts nearing disk space capacity by mount point
Mount Point /
0/5
hosts
Mount Point /efi-boot
0/4
hosts
Mount Point /nix/store
0/5
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
4.16
5 min
3.32
15 min
1.86
CPU overloaded hosts
Percentage of hosts that experienced CPU overload
0.00
%
CPU pressure
CPU pressure over 10, 60, and 300 second averages
10 second average
p5
0.52
%
<
mean
8.9412
%
SD
8.6154
%
<
p95
22
%
60 second average
8.8630
%
300 second average
7.0500
%
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
21.59
%
<
mean
31.774
%
SD
7.9564
%
<
p95
47.16
%
60 second average
31.3988
%
300 second average
25.3815
%
I/O pressure full
I/O pressure (all tasks stalled) over 10, 60 and 300 second averages
10 second average
p5
11.05
%
<
mean
22.238
%
SD
8.2665
%
<
p95
37.04
%
60 second average
22.0315
%
300 second average
18.0903
%
Holochain process CPU usage
CPU usage by Holochain process
p5
0.37
%
<
mean
1.58
%
SD
4.52
%
<
p95
5.22
%
Holochain process memory (PSS)
Proportional Set Size memory of Holochain process
p5
139.80
KiB
<
mean
182.85
KiB
SD
42.38
KiB
<
p95
222.53
KiB
Holochain process threads
Number of threads in Holochain process
p5
13
threads
<
mean
19.18
threads
SD
4.95
threads
<
p95
23
threads
Holochain process file descriptors
Number of file descriptors used by Holochain process
p5
47
file descriptors
<
mean
55.96
file descriptors
SD
14.44
file descriptors
<
p95
83
file descriptors