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update checkvram

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This commit is contained in:
Michael Yang 2023-10-13 14:45:50 -07:00
parent 36fe2deebf
commit 11d82d7b9b
1 changed files with 11 additions and 11 deletions
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22
llm/llama.go
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@ -24,6 +24,7 @@ import (
"time"
"github.com/jmorganca/ollama/api"
"github.com/jmorganca/ollama/format"
)
//go:embed llama.cpp/*/build/*/bin/*
@ -197,7 +198,7 @@ type llama struct {
var errNoGPU = errors.New("nvidia-smi command failed")
// CheckVRAM returns the available VRAM in MiB on Linux machines with NVIDIA GPUs
// CheckVRAM returns the free VRAM in bytes on Linux machines with NVIDIA GPUs
func CheckVRAM() (int64, error) {
cmd := exec.Command("nvidia-smi", "--query-gpu=memory.free", "--format=csv,noheader,nounits")
var stdout bytes.Buffer
@ -207,7 +208,7 @@ func CheckVRAM() (int64, error) {
return 0, errNoGPU
}
var free int64
var freeMiB int64
scanner := bufio.NewScanner(&stdout)
for scanner.Scan() {
line := scanner.Text()
@ -216,15 +217,16 @@ func CheckVRAM() (int64, error) {
return 0, fmt.Errorf("failed to parse available VRAM: %v", err)
}
free += vram
freeMiB += vram
}
if free*1024*1024 < 2*1000*1000*1000 {
freeBytes := freeMiB * 1024 * 1024
if freeBytes < 2*format.GigaByte {
log.Printf("less than 2 GB VRAM available, falling back to CPU only")
free = 0
freeMiB = 0
}
return free, nil
return freeBytes, nil
}
func NumGPU(numLayer, fileSizeBytes int64, opts api.Options) int {
@ -232,7 +234,7 @@ func NumGPU(numLayer, fileSizeBytes int64, opts api.Options) int {
return opts.NumGPU
}
if runtime.GOOS == "linux" {
vramMib, err := CheckVRAM()
freeBytes, err := CheckVRAM()
if err != nil {
if err.Error() != "nvidia-smi command failed" {
log.Print(err.Error())
@ -241,15 +243,13 @@ func NumGPU(numLayer, fileSizeBytes int64, opts api.Options) int {
return 0
}
freeVramBytes := int64(vramMib) * 1024 * 1024 // 1 MiB = 1024^2 bytes
// Calculate bytes per layer
// TODO: this is a rough heuristic, better would be to calculate this based on number of layers and context size
bytesPerLayer := fileSizeBytes / numLayer
// max number of layers we can fit in VRAM, subtract 8% to prevent consuming all available VRAM and running out of memory
layers := int(freeVramBytes/bytesPerLayer) * 92 / 100
log.Printf("%d MiB VRAM available, loading up to %d GPU layers", vramMib, layers)
layers := int(freeBytes/bytesPerLayer) * 92 / 100
log.Printf("%d MiB VRAM available, loading up to %d GPU layers", freeBytes, layers)
return layers
}