# tt_dram_used_megabytes

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## Name

### Prometheus Metric Name

```
tt_dram_used_megabytes
```

### Metric Path (tt-telemetry)

Schema:

```
{hostname}/dram/tt_dram_used_megabytes
```

Example path:

```
bh-glx-c09u02/dram/tt_dram_used_megabytes
```

## Description

Host-level sum of DRAM currently allocated by tt-metal across every MMIO-capable chip on this host, in mebibytes (1 MiB = 1024×1024 B), rounded to the nearest integer.

The per-chip values are read from the same per-device shared-memory regions that back [tt_device_dram_used_megabytes](tt_device_dram_used_megabytes.md). Chips whose SHM region is absent (no tt-metal process has touched them) or whose layout version does not match contribute `0` to the sum.

## Values

**Type:** Unsigned Integer

**Units:** Megabytes (MB) — reported as mebibytes (1 MiB = 1024×1024 B), rounded to the nearest integer.

**Allowable values:**
A non-negative integer. `0` means no chip on this host has a live SHM region with allocations.

## Prometheus Labels

|Label Name|Value|
|---|---|
|hostname|The host from which the metric was collected.|
|hall|The datacenter hall where the host is located. Sourced from the Factory System Descriptor (FSD).|
|aisle|The datacenter aisle where the host is located. Sourced from the Factory System Descriptor (FSD).|
|rack|The rack number where the host is located. Sourced from the Factory System Descriptor (FSD).|
|shelf_u|The shelf U position in the rack where the host is located. Sourced from the Factory System Descriptor (FSD).|
|unit|The unit of measurement. Always `"MB"` for this metric.|