set b = ub when b > ub with embedding #12940
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@ggerganov sorry to @ you like this. Would you be able to take a look. Any suggestions would be great. |
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Dec 10, 2025
Fixes ggml-org#12836 where the server crashes with GGML_ASSERT failure when running with embeddings enabled and n_batch > n_ubatch. Root cause: Embeddings use non-causal attention which requires all tokens to be processed within a single ubatch. When n_batch > n_ubatch, the server attempts to split processing, causing assertion failure. Solution: - Add parameter validation in main() after common_params_parse() - When embeddings enabled and n_batch > n_ubatch: * Log warnings explaining the issue * Automatically set n_batch = n_ubatch * Prevent server crash This follows the approach suggested by @ggerganov in issue ggml-org#12836. Note: This supersedes stalled PR ggml-org#12940 which attempted a runtime fix in the old examples/server/server.cpp location. This implementation validates at startup in tools/server/server.cpp (current location). Testing: - Build: Compiles successfully - Validation triggers: Warns when -b > -ub with --embedding - Auto-correction works: Adjusts n_batch = n_ubatch - No false positives: Valid params don't trigger warnings - Verified on macOS M3 Pro with embedding model
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initial fix attempt toward #12836