Adding debugging capabilities to the CompileModuled by Renaud-K · Pull Request #5035 · NVIDIA/cuda-quantum

Renaud-K · 2026-07-30T22:26:19Z

This PR is adding two environment variables for debug and test purposes.
CUDAQ_COMPILED_MODULE_CACHE_SIZE to control the number of entries in the cache.
CUDAQ_DEBUG_COMPILED_MODULE to activate the debug messages in some key places:

the CompiledModuleCache constructor
the CompiledModuleCache eviction code
the CompiledModule destructor and
the JITEngine destructor

Two tests are attached
test_sync.py
test_async.py

And can be run with:

CUDAQ_COMPILED_MODULE_CACHE_SIZE=1 CUDAQ_DEBUG_COMPILED_MODULE=1 python3 test_sync.py

As of 12f5dba, this produces:

CompiledModuleCache constructor with maxReadyEntries = 1
CompiledModule destructor for kernel1..0x7861794adfa0.run
CompiledModule destructor for kernel1..0x7861794adfa0.run
CompiledModule destructor for kernel1..0x7861794adfa0.run
CompiledModule destructor for kernel1..0x7861794adfa0.run
CompiledModule destructor for kernel1..0x7861794adfa0.run
CompiledModuleCache constructor with maxReadyEntries = 1
CompiledModule destructor for kernel2..0x7861738e3200.run
CompiledModule destructor for kernel2..0x7861738e3200.run
CompiledModule destructor for kernel2..0x7861738e3200.run
CompiledModule destructor for kernel2..0x7861738e3200.run
CompiledModule destructor for kernel2..0x7861738e3200.run
CompiledModuleCache constructor with maxReadyEntries = 1
CompiledModule destructor for kernel3..0x78617aa86000.run
CompiledModule destructor for kernel3..0x78617aa86000.run
CompiledModule destructor for kernel3..0x78617aa86000.run
CompiledModule destructor for kernel3..0x78617aa86000.run
CompiledModule destructor for kernel3..0x78617aa86000.run
[True]
[True]
[True]
Before exiting
CompiledModule destructor for kernel1..0x7861794adfa0.run
Destructing ExecutionEngine
CompiledModule destructor for kernel2..0x7861738e3200.run
Destructing ExecutionEngine
CompiledModule destructor for kernel3..0x78617aa86000.run
Destructing ExecutionEngine

Meaning that 3 distinct caches are created each holding one entry. No eviction happens. ExecutionEngines are deleted on exit.

The ultimate goal would be to support the eviction of a CompiledModule being run asynchronously. I believe this means that a shared_ptr<CompiledModule> instead of a raw pointer needs to be passed to the running thread.

github-actions · 2026-07-30T23:11:20Z

CI Summary (`push`) — ✅ passed

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copy-pr-bot · 2026-07-31T01:52:17Z

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lmondada · 2026-07-31T08:00:25Z

Thanks a lot Renaud, this is a good idea.

One suggestion: could we reuse the logging utilities we already have rather than printing our own outputs? I'm thinking:

Add the option to provide a tag to CUDAQ_DBG calls using an optional argument.
Associate a tag to an env var. When a recognised env var is set, force CUDAQ_LOG_LEVEL=debug and record the set of active tags at startup
Within the CUDAQ_DBG implementation suppress any debug message that isn't tagged with an active tag. That way a message prints only if the tag is active (or if no tag is active and the log level was set manually)

I think this would be useful to have more generally: otherwise we keep adding custom logging mechanism and/or dump everything within the flood of text that CUDAQ_DBG currently prints out. If you want this to work in a release build, replace CUDAQ_DBG with CUDAQ_INFO.

I checked with a text generator to see if it seemed doable without too much effort. Below is the edited suggestion, if you want.

Tag CUDAQ_DBG calls using a distinct enum class, so overload resolution disambiguates tagged vs. untagged. All existing CUDAQ_DBG("...") call sites compile unchanged.

CUDAQ_DBG("x = {}", x);                        // untagged (as today)
CUDAQ_DBG(cudaq::DbgTag::CompiledModuleCache, "x = {}", x); // tagged

logger.h

new tag enum + accessors, two dbgEmit overloads, and the macro now forwards to them:

enum class DbgTag { CompiledModuleCache /* add more */ };
bool isDbgTagActive(DbgTag);
bool anyDbgTagActive();
namespace detail {
template <typename... A>  // untagged
void dbgEmit(const char *f, int l, std::string_view m, A &&...a) {
  if (anyDbgTagActive()) return;            // filtering on: untagged never matches
  logMessage(LogLevel::debug, m, f, l, std::forward<A>(a)...);
}
template <typename... A>  // tagged
void dbgEmit(const char *f, int l, DbgTag t, std::string_view m, A &&...a) {
  if (anyDbgTagActive() && !isDbgTagActive(t)) return;
  logMessage(LogLevel::debug, m, f, l, std::forward<A>(a)...);
}
}
#ifdef CUDAQ_DEBUG
#define CUDAQ_DBG(...)                                                   \
  do {                                                                   \
    if (::cudaq::detail::should_log(::cudaq::detail::LogLevel::debug))   \
      ::cudaq::detail::dbgEmit(__FILE__, __LINE__, __VA_ARGS__);         \
  } while (false)
#endif

logger.cpp

Add a tag table + active state (mirroring the g_timingList() pattern, lines 34-44):

struct DbgTagInfo { DbgTag tag; const char *env; };
static constexpr DbgTagInfo kDbgTags[] = {
    {DbgTag::Compiler, "CUDAQ_LOG_COMPILER"},
};
static std::array<bool, std::size(kDbgTags)> &g_dbgActive();
static bool g_anyDbgActive = false;

Implement accessors:

bool isDbgTagActive(DbgTag tag) { return g_dbgActive()[static_cast<size_t>(tag)]; }
bool anyDbgTagActive() { return g_anyDbgActive; }

In initializeLogger() (after the level parsing, near the CUDAQ_TIMING_TAGS block at lines 71-98): for each entry in kDbgTags, read its env var; if set and truthy (non-empty and not 0/false/off), mark active and set g_anyDbgActive = true. Then force debug on:

if (g_anyDbgActive && spdlog::get_level() > spdlog::level::debug)
  spdlog::set_level(spdlog::level::debug);

Renaud-K · 2026-07-31T14:47:12Z

This can get definitely better. I do not mean for this to be the way of testing moving forward and I do not think that it should be. We can replace it with something more formal once we see the value. But for now, I would just like to have something for the purpose of this discussion.

Renaud-K · 2026-07-31T14:48:12Z

/ok to test 581d899

Command Bot: Processing...

schweitzpgi · 2026-07-31T15:49:43Z

Looks like a great step forward in those two areas. Thanks, Renaud.

lmondada

Thank you!

github-actions · 2026-07-31T19:10:36Z

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Create Python wheels (arm64, 3.11, 13.0) / Validate wheel (redhat/ubi8:8.10, --user)	✅ success	view
Create Python wheels (arm64, 3.11, 13.0) / Validate wheel (redhat/ubi9:9.6)	✅ success	view
Create Python wheels (arm64, 3.11, 13.0) / Validate wheel (redhat/ubi9:9.6, --user)	✅ success	view
Create Python wheels (arm64, 3.11, 13.0) / Validate wheel (ubuntu:22.04)	✅ success	view
Create Python wheels (arm64, 3.11, 13.0) / Validate wheel (ubuntu:22.04, --user)	✅ success	view
Create Python wheels (arm64, 3.11, 13.0) / Validate wheel on GPU (nvidia simulator)	⏩ skipped	view
Create Python wheels (arm64, 3.13, 12.6) / Build Python 3.13 wheel	✅ success	view
Create Python wheels (arm64, 3.13, 12.6) / Prepare validation	✅ success	view
Create Python wheels (arm64, 3.13, 12.6) / Staging	⏩ skipped	view
Create Python wheels (arm64, 3.13, 12.6) / Validate wheel (fedora:42)	✅ success	view
Create Python wheels (arm64, 3.13, 12.6) / Validate wheel (fedora:42, --user)	✅ success	view
Create Python wheels (arm64, 3.13, 12.6) / Validate wheel on GPU (nvidia simulator)	⏩ skipped	view
Create Python wheels (arm64, 3.13, 13.0) / Build Python 3.13 wheel	✅ success	view
Create Python wheels (arm64, 3.13, 13.0) / Prepare validation	✅ success	view
Create Python wheels (arm64, 3.13, 13.0) / Staging	⏩ skipped	view
Create Python wheels (arm64, 3.13, 13.0) / Validate wheel (fedora:42)	✅ success	view
Create Python wheels (arm64, 3.13, 13.0) / Validate wheel (fedora:42, --user)	✅ success	view
Create Python wheels (arm64, 3.13, 13.0) / Validate wheel on GPU (nvidia simulator)	⏩ skipped	view
Create Python wheels (arm64, 3.14, 12.6) / Build Python 3.14 wheel	✅ success	view
Create Python wheels (arm64, 3.14, 12.6) / Prepare validation	✅ success	view
Create Python wheels (arm64, 3.14, 12.6) / Staging	⏩ skipped	view
Create Python wheels (arm64, 3.14, 12.6) / Validate wheel (fedora:42)	✅ success	view
Create Python wheels (arm64, 3.14, 12.6) / Validate wheel (fedora:42, --user)	✅ success	view
Create Python wheels (arm64, 3.14, 12.6) / Validate wheel on GPU (nvidia simulator)	⏩ skipped	view
Create Python wheels (arm64, 3.14, 13.0) / Build Python 3.14 wheel	✅ success	view
Create Python wheels (arm64, 3.14, 13.0) / Prepare validation	✅ success	view
Create Python wheels (arm64, 3.14, 13.0) / Staging	⏩ skipped	view
Create Python wheels (arm64, 3.14, 13.0) / Validate wheel (fedora:42)	✅ success	view
Create Python wheels (arm64, 3.14, 13.0) / Validate wheel (fedora:42, --user)	✅ success	view
Create Python wheels (arm64, 3.14, 13.0) / Validate wheel on GPU (nvidia simulator)	⏩ skipped	view
Gen code coverage	⏩ skipped	view
Load dependencies (amd64, gcc12) / Caching	✅ success	view
Load dependencies (amd64, gcc12) / Finalize	✅ success	view
Load dependencies (amd64, gcc12) / Metadata	✅ success	view
Load dependencies (amd64, llvm) / Caching	✅ success	view
Load dependencies (amd64, llvm) / Finalize	✅ success	view
Load dependencies (amd64, llvm) / Metadata	✅ success	view
Load dependencies (arm64, gcc12) / Caching	✅ success	view
Load dependencies (arm64, gcc12) / Finalize	✅ success	view
Load dependencies (arm64, gcc12) / Metadata	✅ success	view
Load dependencies (arm64, llvm) / Caching	✅ success	view
Load dependencies (arm64, llvm) / Finalize	✅ success	view
Load dependencies (arm64, llvm) / Metadata	✅ success	view
Load source build cache (amd64, 12.6) / Caching	✅ success	view
Load source build cache (amd64, 12.6) / Finalize	✅ success	view
Load source build cache (amd64, 12.6) / Metadata	✅ success	view
Load source build cache (amd64, 13.0) / Caching	✅ success	view
Load source build cache (amd64, 13.0) / Finalize	✅ success	view
Load source build cache (amd64, 13.0) / Metadata	✅ success	view
Load source build cache (arm64, 12.6) / Caching	✅ success	view
Load source build cache (arm64, 12.6) / Finalize	✅ success	view
Load source build cache (arm64, 12.6) / Metadata	✅ success	view
Load source build cache (arm64, 13.0) / Caching	✅ success	view
Load source build cache (arm64, 13.0) / Finalize	✅ success	view
Load source build cache (arm64, 13.0) / Metadata	✅ success	view
Load wheel dependencies (amd64, 12.6) / Caching	✅ success	view
Load wheel dependencies (amd64, 12.6) / Finalize	✅ success	view
Load wheel dependencies (amd64, 12.6) / Metadata	✅ success	view
Load wheel dependencies (amd64, 13.0) / Caching	✅ success	view
Load wheel dependencies (amd64, 13.0) / Finalize	✅ success	view
Load wheel dependencies (amd64, 13.0) / Metadata	✅ success	view
Load wheel dependencies (arm64, 12.6) / Caching	✅ success	view
Load wheel dependencies (arm64, 12.6) / Finalize	✅ success	view
Load wheel dependencies (arm64, 12.6) / Metadata	✅ success	view
Load wheel dependencies (arm64, 13.0) / Caching	✅ success	view
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Prepare cache clean-up	✅ success	view
Retrieve PR info	✅ success	view

✅ Required checks (41/41) — declared in .github/required-checks.yml for merge_group

Required check	Status	Link
Build and test (amd64, llvm, openmpi) / Dev environment (Debug)	✅ success	view
Build and test (amd64, llvm, openmpi) / Dev environment (Python)	✅ success	view
Build and test (arm64, llvm, openmpi) / Dev environment (Debug)	✅ success	view
Build and test (arm64, llvm, openmpi) / Dev environment (Python)	✅ success	view
Build and test (amd64, gcc12, openmpi) / Dev environment (Debug)	✅ success	view
Build and test (amd64, gcc12, openmpi) / Dev environment (Python)	✅ success	view
Build and test (arm64, gcc12, openmpi) / Dev environment (Debug)	✅ success	view
Build and test (arm64, gcc12, openmpi) / Dev environment (Python)	✅ success	view
Create CUDA Quantum installer (amd64, 12.6) / Build CUDA Quantum assets	✅ success	view
Create CUDA Quantum installer (amd64, 12.6) / Minimal OpenMPI installation	✅ success	view
Create CUDA Quantum installer (amd64, 12.6) / Validate installer (debian:12)	✅ success	view
Create CUDA Quantum installer (amd64, 12.6) / Validate installer (fedora:42)	✅ success	view
Create CUDA Quantum installer (amd64, 12.6) / Validate installer (opensuse/leap:15.5)	✅ success	view
Create CUDA Quantum installer (amd64, 12.6) / Validate installer (redhat/ubi9:9.6)	✅ success	view
Create CUDA Quantum installer (amd64, 12.6) / Validate installer (ubuntu:22.04)	✅ success	view
Create CUDA Quantum installer (arm64, 12.6) / Build CUDA Quantum assets	✅ success	view
Create CUDA Quantum installer (arm64, 12.6) / Minimal OpenMPI installation	✅ success	view
Create CUDA Quantum installer (arm64, 12.6) / Validate installer (redhat/ubi9:9.6)	✅ success	view
Create CUDA Quantum installer (arm64, 12.6) / Validate installer (ubuntu:22.04)	✅ success	view
Create Docker images (amd64) / Documentation	✅ success	view
Create Docker images (amd64) / Validation	✅ success	view
Create Docker images (arm64) / Validation	✅ success	view
Create Python metapackages / Build Python metapackages	✅ success	view
Create Python metapackages / Test Python metapackages (3.11)	✅ success	view
Create Python metapackages / Test Python metapackages (3.13)	✅ success	view
Create Python metapackages / Test Python metapackages (3.14)	✅ success	view
Create Python metapackages / Test Python metapackages (12.6, 3.11)	✅ success	view
Create Python metapackages / Test Python metapackages (12.6, 3.13)	✅ success	view
Create Python metapackages / Test Python metapackages (12.6, 3.14)	✅ success	view
Create Python wheels (amd64, 3.11, 12.6) / Validate wheel (debian:12, --user)	✅ success	view
Create Python wheels (amd64, 3.11, 12.6) / Validate wheel (debian:12)	✅ success	view
Create Python wheels (amd64, 3.11, 12.6) / Validate wheel (fedora:42, --user)	✅ success	view
Create Python wheels (amd64, 3.11, 12.6) / Validate wheel (fedora:42)	✅ success	view
Create Python wheels (amd64, 3.11, 12.6) / Validate wheel (redhat/ubi8:8.10, --user)	✅ success	view
Create Python wheels (amd64, 3.11, 12.6) / Validate wheel (redhat/ubi8:8.10)	✅ success	view
Create Python wheels (arm64, 3.11, 12.6) / Validate wheel (debian:12, --user)	✅ success	view
Create Python wheels (arm64, 3.11, 12.6) / Validate wheel (debian:12)	✅ success	view
Create Python wheels (arm64, 3.11, 12.6) / Validate wheel (fedora:42, --user)	✅ success	view
Create Python wheels (arm64, 3.11, 12.6) / Validate wheel (fedora:42)	✅ success	view
Create Python wheels (arm64, 3.11, 12.6) / Validate wheel (redhat/ubi8:8.10, --user)	✅ success	view
Create Python wheels (arm64, 3.11, 12.6) / Validate wheel (redhat/ubi8:8.10)	✅ success	view

Signed-off-by: Renaud Kauffmann <rkauffmann@nvidia.com>

Renaud-K · 2026-07-31T22:38:11Z

/ok to test 73fa500

Command Bot: Processing...

…5035\)" Signed-off-by: Renaud Kauffmann <rkauffmann@nvidia.com>

)" (NVIDIA#5060) ## Summary - Reverts NVIDIA#5035 (`dee5b745`), removing the temporary `CUDAQ_COMPILED_MODULE_CACHE_SIZE` / `CUDAQ_DEBUG_COMPILED_MODULE` debugging hooks from `CompiledModule`, `CompiledModuleCache`, and `JITEngine`. This was introduced as a hack to enable discussion around the deletion of the ExecutionEngine. It is not a productized solution and offers an attack surface. Signed-off-by: Renaud Kauffmann <rkauffmann@nvidia.com>

Renaud-K requested review from khalatepradnya and lmondada July 30, 2026 22:26

github-actions Bot added runtime CUDA quantum runtime python-lang Anything related to the Python CUDA Quantum language implementation labels Jul 30, 2026

khalatepradnya reviewed Jul 31, 2026

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Comment thread runtime/common/CompiledModule.h

Renaud-K force-pushed the compile-module-debug branch from 17c94fd to 581d899 Compare July 31, 2026 01:52

lmondada approved these changes Jul 31, 2026

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Renaud-K added this pull request to the merge queue Jul 31, 2026

Renaud-K force-pushed the compile-module-debug branch from 581d899 to 5a70383 Compare July 31, 2026 20:33

github-merge-queue Bot removed this pull request from the merge queue due to failed status checks Jul 31, 2026

Renaud-K enabled auto-merge July 31, 2026 22:28

Renaud-K added 2 commits July 31, 2026 22:37

Adding debugging capabilities to the CompileModuled

b047dc8

Signed-off-by: Renaud Kauffmann <rkauffmann@nvidia.com>

Review feedback

73fa500

Signed-off-by: Renaud Kauffmann <rkauffmann@nvidia.com>

Renaud-K force-pushed the compile-module-debug branch from 5a70383 to 73fa500 Compare July 31, 2026 22:37

Renaud-K added this pull request to the merge queue Jul 31, 2026

Merged via the queue into NVIDIA:main with commit dee5b74 Aug 1, 2026
71 checks passed

Renaud-K deleted the compile-module-debug branch August 1, 2026 08:40

github-actions Bot pushed a commit that referenced this pull request Aug 1, 2026

Cleaning up docs preview for PR #5035.

8b24484

Renaud-K mentioned this pull request Aug 6, 2026

Revert "Adding debugging capabilities to the CompileModuled (#5035)" #5060

Merged

Renaud-K added a commit to Renaud-K/cuda-quantum that referenced this pull request Aug 6, 2026

Revert "Adding debugging capabilities to the CompileModuled \(NVIDIA#…

17bca27

…5035\)" Signed-off-by: Renaud Kauffmann <rkauffmann@nvidia.com>

bettinaheim added the no release notes Don't list this PR in the release notes label Sep 11, 2026

bettinaheim added this to the release 0.16.0 milestone Sep 11, 2026

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Adding debugging capabilities to the CompileModuled - #5035

Adding debugging capabilities to the CompileModuled#5035
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