Known Issues and Limitations
Below is a list of known issues and limitations related to Application
Performance Snapshot:
- The HTML summary report may be rendered incorrectly with older
browser versions. For correct rendering, please update to the latest
version of your browser.
- If you view the HTML report on Windows* OS from a shared drive,
use any web browser other than Internet Explorer*.
- If you use an unsupported compiler or compiler version, the OpenMP*
related metrics will be unavailable.
- Limitations related to collection of disk usage statistics:
- To collect the statistics, Application Performance Snapshot
uses data provided by the OS. Wait time or idle time caused by
waiting data from the I/O subsystem is measured with relatively
low precision. This is why for short tasks I/O wait time may equal
zero, even in case the I/O subsystem is actively used.
- During a process run, if the system reassigns it to a different
CPU core, the data read/written and I/O wait time will equal zero.
- Limitations related to MPI support:
- All MPICH-based MPI implementations are supported, including
IntelĀ® MPI Library. MPI imbalance information is available only
with the Intel MPI Library. OpenMPI* is not supported.
- The MPI_THREAD_MULTIPLE mode is
not supported.
- Application Performance Snapshot is incompatible with the IntelĀ®
Trace Collector. Avoid analyzing MPI applications with both tools
simultaneously.
- Application Performance Snapshot does not fully support neighborhood
collective communications. It registers only their execution times,
without information about data transmitted and its direction.