1. Galen's fine-grain control of queue pair resources in the openib
BTL.
1. Pasha's new implementation of asychronous HCA event handling.
Pasha's new implementation doesn't take much explanation, but the new
"multifrag" stuff does.
Note that "svn merge" was not used to bring this new code from the
/tmp/ib_multifrag branch -- something Bad happened in the periodic
trunk pulls on that branch making an actual merge back to the trunk
effectively impossible (i.e., lots and lots of arbitrary conflicts and
artifical changes). :-(
== Fine-grain control of queue pair resources ==
Galen's fine-grain control of queue pair resources to the OpenIB BTL
(thanks to Gleb for fixing broken code and providing additional
functionality, Pasha for finding broken code, and Jeff for doing all
the svn work and regression testing).
Prior to this commit, the OpenIB BTL created two queue pairs: one for
eager size fragments and one for max send size fragments. When the
use of the shared receive queue (SRQ) was specified (via "-mca
btl_openib_use_srq 1"), these QPs would use a shared receive queue for
receive buffers instead of the default per-peer (PP) receive queues
and buffers. One consequence of this design is that receive buffer
utilization (the size of the data received as a percentage of the
receive buffer used for the data) was quite poor for a number of
applications.
The new design allows multiple QPs to be specified at runtime. Each
QP can be setup to use PP or SRQ receive buffers as well as giving
fine-grained control over receive buffer size, number of receive
buffers to post, when to replenish the receive queue (low water mark)
and for SRQ QPs, the number of outstanding sends can also be
specified. The following is an example of the syntax to describe QPs
to the OpenIB BTL using the new MCA parameter btl_openib_receive_queues:
{{{
-mca btl_openib_receive_queues \
"P,128,16,4;S,1024,256,128,32;S,4096,256,128,32;S,65536,256,128,32"
}}}
Each QP description is delimited by ";" (semicolon) with individual
fields of the QP description delimited by "," (comma). The above
example therefore describes 4 QPs.
The first QP is:
P,128,16,4
Meaning: per-peer receive buffer QPs are indicated by a starting field
of "P"; the first QP (shown above) is therefore a per-peer based QP.
The second field indicates the size of the receive buffer in bytes
(128 bytes). The third field indicates the number of receive buffers
to allocate to the QP (16). The fourth field indicates the low
watermark for receive buffers at which time the BTL will repost
receive buffers to the QP (4).
The second QP is:
S,1024,256,128,32
Shared receive queue based QPs are indicated by a starting field of
"S"; the second QP (shown above) is therefore a shared receive queue
based QP. The second, third and fourth fields are the same as in the
per-peer based QP. The fifth field is the number of outstanding sends
that are allowed at a given time on the QP (32). This provides a
"good enough" mechanism of flow control for some regular communication
patterns.
QPs MUST be specified in ascending receive buffer size order. This
requirement may be removed prior to 1.3 release.
This commit was SVN r15474.
that exactly describes the buffer to be used as the target of the
operation
* Use the above flag to disable components setting the flag from being
used for real RDMA operations for the one-sided component (the
BTLs will still be used for RDMA transfers for the PML and for
send/receive communication for the OSC component)
This commit was SVN r15375.
VxWorks. Still some issues remaining, I'm sure.
Refs trac:1010
This commit was SVN r15320.
The following Trac tickets were found above:
Ticket 1010 --> https://svn.open-mpi.org/trac/ompi/ticket/1010
than just the PML/BTLs these days. Also clean up the code so that it
handles the situation where not all nodes register information for a given
node (rather than just spinning until that node sends information, like
we do today).
Includes r15234 and r15265 from the /tmp/bwb-modex branch.
This commit was SVN r15310.
The following SVN revisions from the original message are invalid or
inconsistent and therefore were not cross-referenced:
r15234
r15265
The problem is that in the case of threaded builds for every fifo
a head and tail lock will be allocated inside the shared memory
segment and the ptr is stored inside the fifo. In the case that the sm backend
file will be mapped in all processes at the same address (mostly the
case for non-thread builds) this is fine, but in the cases when the
processes map the file at different addresses this addresses cause big
trouble in other processes than the one that allocted the locks.
Therefore the send lock addresses have to be recalculated to match
the local mapping of the processes that use them.
This commit was SVN r15291.
argument to the query for the line speed. This function is still not
documented, and it really look strange that we have to respecify the
nic_id (it's already attached to the endpoint).
This commit was SVN r15241.
flex (which, incidentally, emit ''more'' warnings than earlier
versions). Grumble.
This commit was SVN r15166.
The following SVN revision numbers were found above:
r15158 --> open-mpi/ompi@57d09c10f7
branch:
* Support btl_openib_if_include and btl_openib_if_exclude MCA
parameters, similar to those supported by other BTLs. Each take a
comma-delimited lists of identifiers. Identifiers can be HCA
interface names (e.g., ipath0, mthca1, etc.) or an HCA interface
name and port numbers (e.g., ipath0:1, mthca1:2, etc.). It is an
error to specify both _include and _exclude. If you specify a
non-existant (or non-ACTIVE) HCA and/or port, you'll get a warning
unless you disable the warning by setting the MCA parameter
btl_openib_warn_nonexistent_if to 0.
* Start updating to use BEGIN_C_DECLS and END_C_DECLS
* A few other minor fixes that were picked up along the way.
This commit was SVN r15063.
Set bandwidth for all ports of mthca0:
--mca btl_openib_bandwidth_mthca0 1000
Set bandwidth for port 1 of mthca1:
--mca btl_openib_bandwidth_mthca1:1 1000
Set latency for port 2 lid 123 on mthca0:
--mca btl_openib_latency_mthca0:2:123 20
This commit was SVN r15041.
structures in the system. Instead of using memcmp, use the ns function.
This won't cause a problem as long as all three elements of the name are
ints, but if they have different sizes, alignment and padding rules
can cause memcmp() to compare padding space, which rarely holds a sane
value.
This commit was SVN r14998.
id based on the last half of the mapper MAC. This allow us to figure out how
to connect peers. This allow the MX BTL to be used in a cluster of cluster
configuration where each cluster have MX internally as well as on a multi
rail MX system.
This commit was SVN r14932.
symbols in them and environ is defined only in the final application
(probably in crt1.o). Apple provides a function for getting at the
environment, so use that instead if it's available.
This commit was SVN r14857.
have the SRQ interface.
* Instead of setting AC_DEFINEs per MCA component, set per test. THe
answers can never be difference, and this will speed sed just a teeny
bit
This commit was SVN r14856.
