Prototype of realm subgraph compilation approach - #391

Draft

rohany wants to merge 93 commits into

StanfordLegion:mainfrom

rohany:subgraph-compilation-prototype

Commits on Jan 19, 2026

runtime/realm: MVP attempt to develop a static subgraph
rohany
committed
96ef304
runtime/realm: small optimizations
rohany
committed
d4f7f95
src/realm: fixup for previous commit, make execute_task public
rohany
committed
0899959
runtime/realm: support interpolations for tasks in static schedule
rohany
committed
e50fef4
runtime/realm: add arrival support to static subgraph implementation
rohany
committed
d7c51b0
runtime/realm: support external preconditions in subgraph replay
rohany
committed
5fdb088
runtime/realm: fix bug in external precondition triggering
rohany
committed
ff218c7
runtime/realm: hack to support preloading task funcptrs
rohany
committed
d055c09
Revert "runtime/realm: hack to support preloading task funcptrs"
rohany
committed
dc01512
runtime/realm: support for deferred subgraph execution
rohany
committed
70baf63
runtime/realm: fix typo in subgraph instantiation
rohany
committed
577b639
runtime/realm: stop using the slow merge_events(set<>) API
rohany
committed
764593b
runtime/realm: switch to fresh precondition array for each instantiation
rohany
committed
2f7b68c
runtime/realm: more cleanup for deferred subgraph instantiations
rohany
committed
e889e8c

Commits on Jan 20, 2026

runtime/realm: initial progress towards supporting GPUs in subgraphs
rohany
committed
1b7abae
runtime/realm: bugfixes
rohany
committed
9629b82
src/realm/cuda: use dedicated gpu workers
rohany
committed
2af8510
src/realm/cuda: actually record into the cuda event
rohany
committed
53ea72e
runtime/realm: cleanup before merge
rohany
committed
7037bfe
runtime/realm: small cleanup
rohany
committed
69561be
runtime/realm: switch to a dynamic queue in subgraph replay
rohany
committed
4fe7c4e
runtime/realm: bugfixes+cleanup
rohany
committed
b1d2ff3
runtime/realm: support a static and dynamic partition of the subgraph
rohany
committed
1d065fb
runtime/realm: add support for external postconditions
rohany
committed
b1ab28a
runtime/realm: small cleanup of subgraph replays
rohany
committed
068011d
runtime/realm: optimize copies in subgraph replays
rohany
committed
ee6dd57
runtime/realm: hack to run copies on application processors
rohany
committed
de77e35
src/realm/transfer: small cleanup to xd resetting
rohany
committed
24e1818
runtime/realm: more progress towards copy fast paths
rohany
committed
05a8faf
runtime/realm: bugfixes for asynchronous subgraph operations
rohany
committed
66e4cc9
runtime/realm: hoist subgraph cuda copy functions for other xds
rohany
committed
d6b3d00
src/realm/transfer: remove unnecessary cast
rohany
committed
28db5ae
src/realm/cuda: fix typo
rohany
committed
829af48
runtime,test: QOL cleanup and some bugfixes
rohany
committed
9bcff2b
runtime/realm: update comments
rohany
committed
77b3407
test/realm: test some more interesting kinds of copies
rohany
committed
2f2ca25
runtime/realm: flatten some nested data structures post compilation
rohany
committed
1ea684c
runtime/realm: initial support for copies that use multiple xd's
rohany
committed
96f1d15
runtime/realm: first round of bugfixes for multiple xd's per copy
rohany
committed
0353d98
runtime/realm: be more precise about when copies respect async
rohany
committed
9bf60c0
runtime/realm: clean up some comments
rohany
committed
7dad19a
runtime/realm: always implicitly order subgraph executions
rohany
committed
ef2fea0
tests: fix missing event chain in test
rohany
committed
b074c94
test/realm: improve stencil subgraph test
rohany
committed
1f44fdb
test/realm: add anti-dependencies to stencil app

Rohan Yadav
authored and
rohany
committed
16c5cb1
test/realm: add sanity check on problem size

Rohan Yadav
authored and
rohany
committed
01270c9
tests: update the stencil subgraph application with GPU support
rohany
committed
27144fb
src/realm/cuda: delete streams in channels in the right place
rohany
committed
f0efebe
runtime/realm: fix async op checking bug, order subgraph deletions
rohany
committed
e9fcfd4
runtime/realm,test/realm: initial profiling support for subgraphs
rohany
committed
27175b5
runtime/realm: more bugfixes for subgraph profiling
rohany
committed
18c643e
src/realm/cuda: fix subgraph GPU profiling bug
rohany
committed
73f20d6
runtime/realm: small cleanup for subgraph profiling
rohany
committed
ca19d9e
runtime/realm: fix bugs around completion profiling of GPU tasks
rohany
committed
b5129ca
runtime/realm: ensure subgraphs can't finish before gpu profile reporting
rohany
committed
f501726
runtime/realm: fix race in subgraph profiling scheduling
rohany
committed
0bf6a56
runtime/realm: move subgraph deletions off critical path
rohany
committed
6fda083
runtime/realm: shut down the subgraph reaping background worker
rohany
committed
8b17050
runtime/realm: make subgraph deletion capture instantiation cleanups
rohany
committed
34dc927
runtime/realm: some progress towards shaking out races in miniaero
rohany
committed
4c3557e
runtime/realm: fix nasty race in async copies in subgraph instantiations
rohany
committed
b3b4321
runtime/realm: fix merge fallout
rohany
committed
49ce9a8
runtime/realm: initial support for indirection copies in subgraphs
rohany
committed
697fe68
runtime/realm: refactor copy indirection resource management
rohany
committed
f35ad33
runtime/realm: more copy indirection refactoring
rohany
committed
7edfa6f
runtime/realm: fix typo
rohany
committed
b96399e
runtime/realm: send copies with IBs to the dynamic subgraph partition
rohany
committed
f2c8d40
runtime/realm: plan and execute copies with IBs in the static subgraph
rohany
committed
6b9e0e6
runtime/realm: some bugfixes for ib alloc replays
rohany
committed
c0e9fb5
src/realm/transfer: properly reset more XD iterators
rohany
committed
1213d5d
runtime/realm: avoid an new in ib allocations
rohany
committed
4d4085a
Revert "runtime/realm: avoid an new in ib allocations"
rohany
committed
878f462
runtime/realm: update comment
rohany
committed
c3ce767
runtime/realm: initial pass at supporting remote XDs in subgraph replays
rohany
committed
4bdc028
runtime/realm: first round of bugfixes for remote copy planning
rohany
committed
339630c
src: add missing CMakeLists.txt change
rohany
committed
a2654d2
src: add missing cuda_internal.h change
rohany
committed
4e71ff1
runtime/realm: more bugfixes for remotely planned copies
rohany
committed
9d6c19f
runtime/realm: use remote completions instead explicit responses
rohany
committed
3a48825
runtime/realm: clean up comments
rohany
committed
fb70f4b
runtime/realm: fix potential race in starting external precondition events early
rohany
committed
6cd115d
runtime/realm: add some nvtx annotations for subgraph profiling
rohany
committed
298cbfd
runtime/realm: fix nvtx params
rohany
committed
ccb663b
src/realm/transfer: fix macro
rohany
committed
cef6519
runtime/realm: fix macro
rohany
committed
8781a57
runtime/realm: fix macro
rohany
committed
ee7d22a
runtime/realm: special case event waits within subgraph executions
rohany
committed
35222b5
runtime/realm: make the subgraph scheduler spin/yield customizable
rohany
committed
30e2d0f
runtime/realm: make subgraph barrier arrivals happen on trigger
rohany
committed
0078e86
runtime/realm: fix sneaky race introduced by barrier fix
rohany
committed
015ca13

Commits on Jan 21, 2026

Merge branch 'main' into subgraph-compilation-prototype
rohany
committed
a0ab59e
src/realm: clean up build warning fallout
rohany
committed
b6cdee6

Commits on Jan 28, 2026

src/realm: add a few comments to help guide review
rohany
committed
20f95c3