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Fix transcation window. (#260)

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Shangyan Zhou 2025-06-26 17:58:49 +08:00 committed by GitHub
parent bd429ffefc
commit ed3444bf9b
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GPG Key ID: B5690EEEBB952194
1 changed files with 8 additions and 6 deletions
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14
csrc/kernels/internode.cu
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@ -560,19 +560,21 @@ dispatch(int4* recv_x, float* recv_x_scales, int64_t* recv_topk_idx, float* recv
if (is_token_in_rank_uint64 != 0) {
// Acquire lock first
acquire_lock(rdma_send_channel_lock + lane_id);
// Release the transaction slot
auto window = rdma_send_channel_window[lane_id];
auto latest_tail = rdma_send_channel_tail[lane_id];
auto offset = rdma_tail_idx - latest_tail;
// The same effect with `EP_DEVICE_ASSERT(offset < 32);`
EP_STATIC_ASSERT(kNumDispatchRDMASenderWarps < 32, "Invalid warps");
while (offset >= 32) {
release_lock(rdma_send_channel_lock + lane_id);
acquire_lock(rdma_send_channel_lock + lane_id);
latest_tail = rdma_send_channel_tail[lane_id];
offset = rdma_tail_idx - latest_tail;
}
// Release the transaction slot
// Erase bit and move the ones if possible
window ^= 1u << offset;
if (offset == 0) {
auto num_empty_slots = __ffs(~window) - 1;
auto num_empty_slots = (~window) == 0 ? 32 : __ffs(~window) - 1;
st_release_cta(rdma_send_channel_tail + lane_id, latest_tail + num_empty_slots);
window >>= num_empty_slots;
}