Roopa Malavally
2fd36e33ad
Change-Id: I3e4db2c50a43a51eeea4d3e06ba4811ad1859368 Signed-off-by: Charis Poag <Charis.Poag@amd.com>
48 regels
1.8 KiB
ReStructuredText
48 regels
1.8 KiB
ReStructuredText
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.. meta::
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:description: Using ROCm SMI
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:keywords: install, SMI, library, api, AMD, ROCm
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Using C++ in ROCm SMI
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*********************
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Device indices
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---------------
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Many of the functions in the library take a "device index". The device index is a number greater than or equal to 0, and less than the number of devices detected, as determined by `rsmi_num_monitor_devices()`. The index is used to distinguish the detected devices from one another. It is important to note that a device may end up with a different index after a reboot, so an index should not be relied upon to be constant over reboots.
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Hello ROCm SMI
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================
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The only required ROCm-SMI call for any program that wants to use ROCm-SMI is the `rsmi_init()` call. This call initializes some internal data structures that will be used by subsequent ROCm-SMI calls.
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When ROCm-SMI is no longer being used, `rsmi_shut_down()` should be called. This provides a way to do any releasing of resources that ROCm-SMI may have held. In many cases, this may have no effect, but may be necessary in future versions of the library.
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A simple "Hello World" type program that displays the device ID of detected devices would look like this:
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.. code-block:: c
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#include <stdint.h>
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#include "rocm_smi/rocm_smi.h"
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int main() {
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rsmi_status_t ret;
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uint32_t num_devices;
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uint16_t dev_id;
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// We will skip return code checks for this example, but it
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// is recommended to always check this as some calls may not
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// apply for some devices or ROCm releases
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ret = rsmi_init(0);
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ret = rsmi_num_monitor_devices(&num_devices);
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for (int i=0; i < num_devices; ++i) {
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ret = rsmi_dev_id_get(i, &dev_id);
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// dev_id holds the device ID of device i, upon a
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// successful call
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}
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ret = rsmi_shut_down();
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return 0;
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}
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