Learn about all the recorded metrics: active users, response times and counts
As Gatling runs and executes requests, several timings are recorded, which make up the basis of all forms of reporting in Gatling: console, HTML reports, etc…
At a given second, active users are computed as:
(the number of active users at the previous second)
+ (the number of users who started during this second)
- (the number of users who finished during the previous second)
The response time is the elapsed time between:
- the instant Gatling tries to send a request. It accounts for:
- DNS resolution time (might be bypassed if it’s already cached). Note that the DNS resolution time metric is available in Gatling Enterprise.
- TCP connect time (might be bypassed if a keep-alive connection is available in the connection pool). Note that the TCP connect time metric is available in Gatling Enterprise.
- TLS handshake time (might be bypassed if a keep-alive connection is available in the connection pool). Note that the TLS handshake time metric is available in Gatling Enterprise.
- HTTP round trip
- the instant Gatling receives a complete response or experiences an error (timeout, connection error, etc)
The counts are the number of group executions, not the sum of the counts of each individual request in that group.
The response time of a group is the cumulated response times of each individual request in that group.
Group duration is the elapsed time between the instant a virtual user enters a group and the instant it exits.
Group duration is reported in the “Duration” charts.
Cumulated Response Time
Group cumulated response time is the time in a group when requests are flying: requests’ response time and resources start to end duration. In short, it’s the group duration minus the pauses.
Group cumulated response time is reported in the “Cumulated Response Time” charts.