diff options
Diffstat (limited to 'Documentation/mic')
| -rw-r--r-- | Documentation/mic/index.rst | 16 | ||||
| -rw-r--r-- | Documentation/mic/mic_overview.rst (renamed from Documentation/mic/mic_overview.txt) | 6 | ||||
| -rw-r--r-- | Documentation/mic/scif_overview.rst (renamed from Documentation/mic/scif_overview.txt) | 58 |
3 files changed, 55 insertions, 25 deletions
diff --git a/Documentation/mic/index.rst b/Documentation/mic/index.rst new file mode 100644 index 000000000000..3a8d06367ef1 --- /dev/null +++ b/Documentation/mic/index.rst @@ -0,0 +1,16 @@ +============================================= +Intel Many Integrated Core (MIC) architecture +============================================= + +.. toctree:: + :maxdepth: 1 + + mic_overview + scif_overview + +.. only:: subproject and html + + Indices + ======= + + * :ref:`genindex` diff --git a/Documentation/mic/mic_overview.txt b/Documentation/mic/mic_overview.rst index 074adbdf83a4..17d956bdaf7c 100644 --- a/Documentation/mic/mic_overview.txt +++ b/Documentation/mic/mic_overview.rst @@ -1,3 +1,7 @@ +====================================================== +Intel Many Integrated Core (MIC) architecture overview +====================================================== + An Intel MIC X100 device is a PCIe form factor add-in coprocessor card based on the Intel Many Integrated Core (MIC) architecture that runs a Linux OS. It is a PCIe endpoint in a platform and therefore @@ -45,7 +49,7 @@ Here is a block diagram of the various components described above. The virtio backends are situated on the host rather than the card given better single threaded performance for the host compared to MIC, the ability of the host to initiate DMA's to/from the card using the MIC DMA engine and -the fact that the virtio block storage backend can only be on the host. +the fact that the virtio block storage backend can only be on the host:: +----------+ | +----------+ | Card OS | | | Host OS | diff --git a/Documentation/mic/scif_overview.txt b/Documentation/mic/scif_overview.rst index 0a280d986731..4c8ad9e43706 100644 --- a/Documentation/mic/scif_overview.txt +++ b/Documentation/mic/scif_overview.rst @@ -1,3 +1,7 @@ +======================================== +Symmetric Communication Interface (SCIF) +======================================== + The Symmetric Communication Interface (SCIF (pronounced as skiff)) is a low level communications API across PCIe currently implemented for MIC. Currently SCIF provides inter-node communication within a single host platform, where a @@ -8,8 +12,11 @@ is to deliver the maximum possible performance given the communication abilities of the hardware. SCIF has been used to implement an offload compiler runtime and OFED support for MPI implementations for MIC coprocessors. -==== SCIF API Components ==== +SCIF API Components +=================== + The SCIF API has the following parts: + 1. Connection establishment using a client server model 2. Byte stream messaging intended for short messages 3. Node enumeration to determine online nodes @@ -28,9 +35,12 @@ can also register local memory which is followed by data transfer using either DMA, CPU copies or remote memory mapping via mmap. SCIF supports both user and kernel mode clients which are functionally equivalent. -==== SCIF Performance for MIC ==== +SCIF Performance for MIC +======================== + DMA bandwidth comparison between the TCP (over ethernet over PCIe) stack versus -SCIF shows the performance advantages of SCIF for HPC applications and runtimes. +SCIF shows the performance advantages of SCIF for HPC applications and +runtimes:: Comparison of TCP and SCIF based BW @@ -66,33 +76,33 @@ space API similar to the kernel API in scif.h. The SCIF user space library is distributed @ https://software.intel.com/en-us/mic-developer Here is some pseudo code for an example of how two applications on two PCIe -nodes would typically use the SCIF API: +nodes would typically use the SCIF API:: -Process A (on node A) Process B (on node B) + Process A (on node A) Process B (on node B) -/* get online node information */ -scif_get_node_ids(..) scif_get_node_ids(..) -scif_open(..) scif_open(..) -scif_bind(..) scif_bind(..) -scif_listen(..) -scif_accept(..) scif_connect(..) -/* SCIF connection established */ + /* get online node information */ + scif_get_node_ids(..) scif_get_node_ids(..) + scif_open(..) scif_open(..) + scif_bind(..) scif_bind(..) + scif_listen(..) + scif_accept(..) scif_connect(..) + /* SCIF connection established */ -/* Send and receive short messages */ -scif_send(..)/scif_recv(..) scif_send(..)/scif_recv(..) + /* Send and receive short messages */ + scif_send(..)/scif_recv(..) scif_send(..)/scif_recv(..) -/* Register memory */ -scif_register(..) scif_register(..) + /* Register memory */ + scif_register(..) scif_register(..) -/* RDMA */ -scif_readfrom(..)/scif_writeto(..) scif_readfrom(..)/scif_writeto(..) + /* RDMA */ + scif_readfrom(..)/scif_writeto(..) scif_readfrom(..)/scif_writeto(..) -/* Fence DMAs */ -scif_fence_signal(..) scif_fence_signal(..) + /* Fence DMAs */ + scif_fence_signal(..) scif_fence_signal(..) -mmap(..) mmap(..) + mmap(..) mmap(..) -/* Access remote registered memory */ + /* Access remote registered memory */ -/* Close the endpoints */ -scif_close(..) scif_close(..) + /* Close the endpoints */ + scif_close(..) scif_close(..) |