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How can the Metal resource limit be queried or configured on macOS?

Status: Open.

#3849 In ml-explore/mlx;

· Lyxot opened on Jul 16, 2026

mx.random.categorical(logits, num_samples=M) allocates O(N·M) memory

Status: Open.

#3847 In ml-explore/mlx;

· michaelellis003 opened on Jul 15, 2026

qmv_wide: residual small-m cost on larger shapes — m=4–8 still 1.5–2.7x of m=1 on M4 Pro

Status: Open.

#3839 In ml-explore/mlx;

· abcgco opened on Jul 13, 2026

[Performance] Vector SDPA achieves only ~25% of memory bandwidth for GQA (4 KV heads, head_dim 256) at long context on M1 Ultra

Status: Open.

#3837 In ml-explore/mlx;

· KaiserCaiser opened on Jul 12, 2026

[BUG] fast.metal_kernel: same-name kernels with different sources silently run stale code within one eval batch

Status: Open.

#3832 In ml-explore/mlx;

· Jinge-Wang opened on Jul 11, 2026

[BUG] Distributed pipeline generation: Metal fence handoff deadlocks under MLX_METAL_FAST_SYNCH=1 (TCP ring; orphaned fence_wait kernel locks GPU until reboot) and hits the ~5s GPU watchdog when unset (kIOGPUCommandBufferCallbackErrorTimeout at ~7.3k tokens)

Status: Open.

#3830 In ml-explore/mlx;

· geekybraindev opened on Jul 10, 2026

mx.fast.scaled_dot_product_attention: 2.3–2.8× latency jump from L=8 to L=12 queries (kernel-routing gap), flat until L≥48

performance

Status: Open.

#3826 In ml-explore/mlx;

· pierre427 opened on Jul 9, 2026

mx.sum over a non-last axis returns all zeros for certain large tensors (e.g. [1, 32, 4096, 131072])

bug

Status: Open.

#3784 In ml-explore/mlx;

· aidiffuser opened on Jun 30, 2026

[BUG] JACCL segfaults in ibv_reg_mr (null PD) when RDMA absent; distributed_config says "RDMA not enabled" despite rdma_ctl status=enabled, survives cold boot (macOS 26.5.1 / 25F80)

bug

distributed

Status: Open.

#3777 In ml-explore/mlx;

· andrewkriley opened on Jun 29, 2026

[Feature]: Supporting normal python datatypes in the grad method obtained from mlx.core.value_and_grad

enhancement

low priority

Status: Open.

#3774 In ml-explore/mlx;

· aaishwarymishra opened on Jun 26, 2026

Feature Request: Least Squares Solver

enhancement

low priority

Status: Open.

#3773 In ml-explore/mlx;

· danlee2002 opened on Jun 26, 2026

[BUG] ring and jaccl both fail to connect (error 60/65) on 4-node M3 Ultra cluster — IP network verified routable, full mesh confirmed

distributed

Status: Open.

#3755 In ml-explore/mlx;

· rogerstom-lgtm opened on Jun 23, 2026