Call chain interval resource impact aggregation differencing

A computer-readable storage medium configured with data and with instructions that when executed by at least one processor causes the processor(s) to perform a technical process for inspecting usage of a computational resource, the process comprising:

• obtaining resource usage stack traces which were recorded during execution of a software program when one or more of the following occurred:
• the computational resource was sampled, a portion of the computational resource was allocated, or a portion of the computational resource was freed;
• noting at least two snapshot requests, each snapshot request having a timestamp indicating a position of the snapshot request within an execution period of the software program;
• for each of the at least two snapshot requests, assigning resource usage stack traces to a respective snapshot set of that snapshot request based on resource usage stack trace lifespans and the timestamp of that snapshot request;
• for each of the at least two snapshot sets, unifying call chains of the resource usage stack traces of that snapshot set by identifying instances of at least one shared call chain in at least two of the resource usage stack traces and by summing respective resource impacts of each instance of the shared call chain, thereby producing a snapshot aggregation for each of at least two snapshot requests, each snapshot aggregation including unified call chains with respective summed resource impacts;
• and
• differencing at least two snapshot aggregations by subtracting the unified call chain summed resource impacts of one snapshot aggregation from the respective unified call chain summed resource impacts of another snapshot aggregation.

A computer system comprising:

• a logical processor;
• a memory in operable communication with the logical processor;
• resource usage stack traces residing in the memory, the resource usage stack traces having constituent call chains and associated resource impacts which indicate one or more of the following events during execution of a software program:
• a computational resource was sampled, a portion of a computational resource was allocated, or a portion of a computational resource was freed;
• at least two snapshot requests residing in the memory, each snapshot request having a timestamp indicating a position of the snapshot request within an execution period of the software program;
• and
• a snapshot aggregation for each of at least two snapshot requests, each snapshot aggregation including unified call chains with respective summed resource impacts which are consistent with the resource usage stack traces, constituent call chains, associated resource impacts, and the snapshot request timestamps.