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
Fri, 27 Mar 2026 00:23:12 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_23624709263
Create rate
The average number of created records per agent.
Mean
mean
47.95
/s
Max
Highest per-partition mean rate
max
82.38
/s
Min
Lowest per-partition mean rate
min
10.35
/s
Sync lag timing
The average time between when a record was created and when it is first seen by an agent.
Mean
mean
451.032827
s
SD
358.979535
s
Max
Highest per-partition mean latency
max mean
778.284971
s
Min
Lowest per-partition mean latency
min mean
29.240468
s
Sync lag rate
The average number of created records discovered per agent.
Mean
mean
42.86
/s
Max
Highest per-partition mean rate
max
137.44
/s
Min
Lowest per-partition mean rate
min
0
/s
Error count
The number of errors encountered during the scenario.
82
Host Metrics
User CPU usage
CPU usage by user space
37.48
%
Network receive rate (primary)
Rate of bytes received on primary network interface
p5
52.46
KiB/s
<
mean
559.95
KiB/s
SD
465.39
KiB/s
<
p95
1.31
MiB/s
Network send rate (primary)
Rate of bytes sent on primary network interface
p5
22.44
KiB/s
<
mean
557.68
KiB/s
SD
763.66
KiB/s
<
p95
2.24
MiB/s
Total bytes received
Total bytes received on primary network interface
count
20.47
GiB
mean
11.15
MiB/s
Total bytes sent
Total bytes sent on primary network interface
count
20.39
GiB
mean
11.10
MiB/s
CPU spike anomaly
CPU spike anomaly was detected
Detected

Warning CPU p99 reached 97.7%

Memory leak anomaly
Memory leak anomaly was detected
Detected

Warning Memory growing at 989.54 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 10% 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
11.7
%
<
mean
43.47
%
SD
24.47
%
<
p95
95.77
%
System
5.99
%
CPU percentiles
CPU usage percentiles
p50
38.81
%
p95
95.77
%
p99
97.69
%
CPU usage above 80%
Number of hosts above 80% CPU and mean time spent above threshold for those hosts
count
9
hosts
mean time
0.26
s
Memory used percentage
Percentage of memory used
p5
6.26
%
<
mean
10.49
%
SD
2.72
%
<
p95
14.01
%
Memory available percentage
Percentage of available memory
p5
85.99
%
<
mean
89.51
%
SD
2.72
%
<
p95
93.74
%
Max host memory used
Maximum memory usage percentage across all hosts
max
13.64
%
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
989.54
MiB/s
Disk read throughput
Disk read throughput in MiB/s
10.66
MiB/s
Disk write throughput
Disk write throughput in MiB/s
275.43
MiB/s
Disk space utilization risk
Number of hosts nearing disk space capacity by mount point
Mount Point /
0/21
hosts
Mount Point /boot
0/2
hosts
Mount Point /efi-boot
0/14
hosts
Mount Point /nix/store
0/21
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
4.33
5 min
3.75
15 min
2.52
CPU overloaded hosts
Percentage of hosts that experienced CPU overload
9.52
%
CPU pressure
CPU pressure over 10, 60, and 300 second averages
10 second average
p5
0
%
<
mean
7.7517
%
SD
10.7777
%
<
p95
34.35
%
60 second average
7.5365
%
300 second average
6.5761
%
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
18.7863
%
SD
16.9316
%
<
p95
45.72
%
60 second average
18.3772
%
300 second average
15.9104
%
I/O pressure full
I/O pressure (all tasks stalled) over 10, 60 and 300 second averages
10 second average
p5
0
%
<
mean
13.6623
%
SD
13.4924
%
<
p95
38.76
%
60 second average
13.3693
%
300 second average
11.5423
%
Holochain process CPU usage
CPU usage by Holochain process
p5
8.95
%
<
mean
40.24
%
SD
24.23
%
<
p95
93.82
%
Holochain process memory (PSS)
Proportional Set Size memory of Holochain process
p5
265.10
KiB
<
mean
453.50
KiB
SD
179.38
KiB
<
p95
821.49
KiB
Holochain process threads
Number of threads in Holochain process
p5
24
threads
<
mean
42.4
threads
SD
13.97
threads
<
p95
57
threads
Holochain process file descriptors
Number of file descriptors used by Holochain process
p5
74
file descriptors
<
mean
94.74
file descriptors
SD
18.78
file descriptors
<
p95
132
file descriptors

Remote Signals

This scenario tests the throughput of remote_signals operations.

Started
Fri, 27 Mar 2026 00:53:40 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_23624709263
Round trip time
The time from origin signal dispatch to origin receive of the remote side's response signal.
mean
0.034364
s
SD
0.222914
s
p50
0.02224
s
<
p95
0.048808
s
<
p99
0.065579
s
Timeouts
The number of timeouts waiting for the remote side's response signal (default timeout is 20 seconds).
0
Host Metrics
User CPU usage
CPU usage by user space
1.32
%
Network receive rate (primary)
Rate of bytes received on primary network interface
p5
4.86
KiB/s
<
mean
6.53
KiB/s
SD
5.69
KiB/s
<
p95
10.54
KiB/s
Network send rate (primary)
Rate of bytes sent on primary network interface
p5
4.71
KiB/s
<
mean
6.67
KiB/s
SD
7.59
KiB/s
<
p95
9.15
KiB/s
Total bytes received
Total bytes received on primary network interface
count
22.69
MiB
mean
26.11
KiB/s
Total bytes sent
Total bytes sent on primary network interface
count
23.17
MiB
mean
26.66
KiB/s
CPU spike anomaly
CPU spike anomaly was detected
NotDetected
Memory leak anomaly
Memory leak anomaly was detected
NotDetected
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
1.25
%
<
mean
2.16
%
SD
5.04
%
<
p95
2.4
%
System
0.84
%
CPU percentiles
CPU usage percentiles
p50
1.59
%
p95
2.40
%
p99
4.65
%
CPU usage above 80%
Number of hosts above 80% CPU and mean time spent above threshold for those hosts
count
0
hosts
mean time
0.00
s
Memory used percentage
Percentage of memory used
p5
7.26
%
<
mean
8.83
%
SD
2.45
%
<
p95
12.96
%
Memory available percentage
Percentage of available memory
p5
87.08
%
<
mean
91.17
%
SD
2.45
%
<
p95
92.74
%
Max host memory used
Maximum memory usage percentage across all hosts
max
12.99
%
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
-71.21
MiB/s
Disk read throughput
Disk read throughput in MiB/s
0.00
MiB/s
Disk write throughput
Disk write throughput in MiB/s
2.71
MiB/s
Disk space utilization risk
Number of hosts nearing disk space capacity by mount point
Mount Point /
0/4
hosts
Mount Point /efi-boot
0/2
hosts
Mount Point /nix/store
0/4
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
0.51
5 min
1.92
15 min
3.26
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
%
<
mean
0.5886
%
SD
3.7339
%
<
p95
0.78
%
60 second average
1.1751
%
300 second average
4.0220
%
Memory pressure some
Memory pressure (some tasks stalled) over 10, 60, and 300 second averages
10 second average
p5
0
%
<
mean
0.0003
%
SD
0.0038
%
≤
p95
0
%
60 second average
0.0008
%
300 second average
0.0001
%
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
0.6731
%
SD
1.9791
%
<
p95
2.43
%
60 second average
1.2091
%
300 second average
3.8625
%
I/O pressure full
I/O pressure (all tasks stalled) over 10, 60 and 300 second averages
10 second average
p5
0
%
<
mean
0.6358
%
SD
1.853
%
<
p95
2.37
%
60 second average
1.0322
%
300 second average
3.0341
%
Holochain process CPU usage
CPU usage by Holochain process
p5
0.31
%
<
mean
0.67
%
SD
2.24
%
<
p95
0.8
%
Holochain process memory (PSS)
Proportional Set Size memory of Holochain process
p5
169.19
KiB
<
mean
183.95
KiB
SD
21.96
KiB
<
p95
205.69
KiB
Holochain process threads
Number of threads in Holochain process
p5
16
threads
<
mean
17.67
threads
SD
2.17
threads
<
p95
21
threads
Holochain process file descriptors
Number of file descriptors used by Holochain process
p5
48
file descriptors
<
mean
55.28
file descriptors
SD
10.56
file descriptors
<
p95
78
file descriptors