ollama/gpu/gpu.go

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//go:build linux || windows
package gpu
/*
#cgo linux LDFLAGS: -lrt -lpthread -ldl -lstdc++ -lm
#cgo windows LDFLAGS: -lpthread
#include "gpu_info.h"
*/
import "C"
import (
"fmt"
"log"
"runtime"
"sync"
"unsafe"
)
type handles struct {
cuda *C.cuda_handle_t
rocm *C.rocm_handle_t
}
var gpuMutex sync.Mutex
var gpuHandles *handles = nil
// With our current CUDA compile flags, 5.2 and older will not work properly
const CudaComputeMajorMin = 6
// Note: gpuMutex must already be held
func initGPUHandles() {
// TODO - if the ollama build is CPU only, don't do these checks as they're irrelevant and confusing
log.Printf("Detecting GPU type")
gpuHandles = &handles{nil, nil}
var resp C.cuda_init_resp_t
C.cuda_init(&resp)
if resp.err != nil {
log.Printf("CUDA not detected: %s", C.GoString(resp.err))
C.free(unsafe.Pointer(resp.err))
var resp C.rocm_init_resp_t
C.rocm_init(&resp)
if resp.err != nil {
log.Printf("ROCm not detected: %s", C.GoString(resp.err))
C.free(unsafe.Pointer(resp.err))
} else {
log.Printf("Radeon GPU detected")
rocm := resp.rh
gpuHandles.rocm = &rocm
}
} else {
log.Printf("Nvidia GPU detected")
cuda := resp.ch
gpuHandles.cuda = &cuda
}
}
func GetGPUInfo() GpuInfo {
// TODO - consider exploring lspci (and equivalent on windows) to check for
// GPUs so we can report warnings if we see Nvidia/AMD but fail to load the libraries
gpuMutex.Lock()
defer gpuMutex.Unlock()
if gpuHandles == nil {
initGPUHandles()
}
var memInfo C.mem_info_t
resp := GpuInfo{}
if gpuHandles.cuda != nil {
C.cuda_check_vram(*gpuHandles.cuda, &memInfo)
if memInfo.err != nil {
log.Printf("error looking up CUDA GPU memory: %s", C.GoString(memInfo.err))
C.free(unsafe.Pointer(memInfo.err))
} else {
// Verify minimum compute capability
var cc C.cuda_compute_capability_t
C.cuda_compute_capability(*gpuHandles.cuda, &cc)
if cc.err != nil {
log.Printf("error looking up CUDA GPU compute capability: %s", C.GoString(cc.err))
C.free(unsafe.Pointer(cc.err))
} else if cc.major >= CudaComputeMajorMin {
log.Printf("CUDA Compute Capability detected: %d.%d", cc.major, cc.minor)
resp.Library = "cuda"
} else {
log.Printf("CUDA GPU is too old. Falling back to CPU mode. Compute Capability detected: %d.%d", cc.major, cc.minor)
}
}
} else if gpuHandles.rocm != nil {
C.rocm_check_vram(*gpuHandles.rocm, &memInfo)
if memInfo.err != nil {
log.Printf("error looking up ROCm GPU memory: %s", C.GoString(memInfo.err))
C.free(unsafe.Pointer(memInfo.err))
} else {
resp.Library = "rocm"
}
}
if resp.Library == "" {
C.cpu_check_ram(&memInfo)
// In the future we may offer multiple CPU variants to tune CPU features
if runtime.GOOS == "windows" {
resp.Library = "cpu"
} else {
resp.Library = "default"
}
}
if memInfo.err != nil {
log.Printf("error looking up CPU memory: %s", C.GoString(memInfo.err))
C.free(unsafe.Pointer(memInfo.err))
return resp
}
resp.DeviceCount = uint32(memInfo.count)
resp.FreeMemory = uint64(memInfo.free)
resp.TotalMemory = uint64(memInfo.total)
return resp
}
func getCPUMem() (memInfo, error) {
var ret memInfo
var info C.mem_info_t
C.cpu_check_ram(&info)
if info.err != nil {
defer C.free(unsafe.Pointer(info.err))
return ret, fmt.Errorf(C.GoString(info.err))
}
ret.FreeMemory = uint64(info.free)
ret.TotalMemory = uint64(info.total)
return ret, nil
}
func CheckVRAM() (int64, error) {
gpuInfo := GetGPUInfo()
if gpuInfo.FreeMemory > 0 && (gpuInfo.Library == "cuda" || gpuInfo.Library == "rocm") {
// leave 10% or 384Mi of VRAM free for unaccounted for overhead
overhead := gpuInfo.FreeMemory * uint64(gpuInfo.DeviceCount) / 10
if overhead < 384*1024*1024 {
overhead = 384 * 1024 * 1024
}
return int64(gpuInfo.FreeMemory - overhead), nil
}
return 0, fmt.Errorf("no GPU detected") // TODO - better handling of CPU based memory determiniation
}