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docs: mention HELION_BACKEND=tileir alongside ENABLE_TILE=1 #47

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msaroufim merged 1 commit into from
Mar 14, 2026
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docs: mention HELION_BACKEND=tileir alongside ENABLE_TILE=1 #47

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6 changes: 3 additions & 3 deletions docs/helion-hackathon.md
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Expand Up @@ -291,11 +291,11 @@ def my_kernel(...):

The B200 instances also ship with **nvtriton**, NVIDIA's extended Triton compiler that includes a **TileIR** backend — an alternative compilation pipeline that bypasses LLVM and compiles directly to CUBIN via NVIDIA's `tileiras` compiler.

| | `ENABLE_TILE=0` (default) | `ENABLE_TILE=1` |
| | `ENABLE_TILE=0` (default) | `ENABLE_TILE=1` + `HELION_BACKEND=tileir` |
|---|---|---|
| **Helion backend** | `triton` | `tileir` |

**Step 1: Enable TileIR and autotune.** Set the env vars before importing Helion, then autotune as usual. Helion automatically adjusts the search space for the TileIR backend.
**Step 1: Enable TileIR and autotune.** Set both `ENABLE_TILE=1` and `HELION_BACKEND=tileir` env vars before importing Helion, then autotune as usual. Helion automatically adjusts the search space for the TileIR backend.

**Step 2: Hardcode the TileIR config in your submission.** Copy the best config from the autotuner output (it will include TileIR-specific fields like `num_ctas` and `occupancy`). The env vars must be set before imports:

Expand All @@ -320,7 +320,7 @@ def my_kernel(...):

### Which should I use?

Try both `ENABLE_TILE=0` and `ENABLE_TILE=1`, with and without ACFs, then submit whichever gives the best benchmark numbers.
Try both the default backend (`ENABLE_TILE=0`) and the TileIR backend (`ENABLE_TILE=1` + `HELION_BACKEND=tileir`), with and without ACFs, then submit whichever gives the best benchmark numbers.

## Tips

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