Cache simulator error when using multi-threaded applications

[Mateusz Kalinowski]

Hello all community members!

I am writing with one question. I try to use cache_simulator_t directly in my client code (I am feeding memory references to the process_memref function). My client works perfectly fine with single-threaded applications. I receive one error when testing multi-threaded ones:

dynamorio/clients/drcachesim/simulator/caching_device.cpp:142: virtual void caching_device_t::request(const memref_t&): Assertion `tag != TAG_INVALID && tag == cache_block->tag_' failed.

Are cache_simulator_t and process_memref supposed to be thread safe? This error happens randomly and it looks like a concurrent access issue. Is there anything I might have missed?

Thank you!

Mateusz

[Derek Bruening]

The cache simulator does not support concurrent processing.  You can tell because its parallel_shard_supported() function returns false, and it does not have a parallel_shard_memref() function (see https://dynamorio.org/sec_drcachesim_newtool.html).  The cache simulator runs serially, fed a timestamp-ordered interleaved stream of accesses from the traced threads by the serial iterator.

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