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Georgi Gerganov 2024-01-24 00:01:54 +02:00
parent 06c2d0d117
commit 035c4f01e6
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3 changed files with 55 additions and 52 deletions
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5
ggml-metal.m
View File

@ -2183,6 +2183,7 @@ static bool ggml_metal_graph_compute(
struct ggml_tensor * src3 = gf->nodes[i]->src[3];
GGML_ASSERT(ggml_are_same_shape(src1, src2));
GGML_ASSERT(src3);
size_t offs_src2 = 0;
size_t offs_src3 = 0;
@ -2252,11 +2253,11 @@ static bool ggml_metal_graph_compute(
[encoder setBytes:&ne3 length:sizeof( int64_t) atIndex:26];
[encoder setBytes:&scale length:sizeof( float) atIndex:27];
const int64_t nwarps = 8;
const int64_t nwarps = 4;
const int64_t nhptg = 2; // heads per threadgroup !! sync with kernel template arguments !!
const int64_t nqptg = 4; // queries per threadgroup !! sync with kernel template arguments !!
const size_t smem = nqptg*(nhptg*ne00 + nwarps*(nhptg*ne00 + 32))*(sizeof(float)/2);
const size_t smem = nqptg*(nhptg*ne00 + nwarps*(nhptg*ne00 + 256))*(sizeof(float)/2);
GGML_ASSERT(smem <= ctx->device.maxThreadgroupMemoryLength);
[encoder setThreadgroupMemoryLength:smem atIndex:0];

94
ggml-metal.metal
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@ -2070,7 +2070,7 @@ kernel void kernel_flash_attn_ext_f16(
device const float * mp[Q];
for (int64_t j = 0; j < Q; ++j) {
if (iq1 + j < ne01) {
mp[j] = mask ? (device const float *) (mask + ((ir + j)%ne31)*nb31) : nullptr;
mp[j] = (device const float *) (mask + ((ir + j)%ne31)*nb31);
} else {
mp[j] = nullptr;
}
@ -2078,13 +2078,13 @@ kernel void kernel_flash_attn_ext_f16(
const int64_t D4 = D/4;
const int64_t T = (H*D + nsg*(H*D + 32)); // shared memory size per query in half
const int64_t T = (H*D + nsg*(H*D + 256)); // shared memory size per query in half
const int64_t T4 = T/4; // shared memory size per query in half4
threadgroup half4 * pq4 = (threadgroup half4 *) (shared + 0*H*D);
threadgroup half4 * ps4 = (threadgroup half4 *) (shared + sgitg*(H*D + 32) + 1*H*D);
threadgroup half * ss = (threadgroup half *) (shared + sgitg*(H*D + 32) + 2*H*D);
threadgroup half4 * ss4 = (threadgroup half4 *) (shared + sgitg*(H*D + 32) + 2*H*D);
threadgroup half4 * pq4 = (threadgroup half4 *) (shared + 0*H*D);
threadgroup half4 * ps4 = (threadgroup half4 *) (shared + sgitg*(H*D + 256) + 1*H*D);
threadgroup half * ss = (threadgroup half *) (shared + sgitg*(H*D + 256) + 2*H*D);
threadgroup half4 * ss4 = (threadgroup half4 *) (shared + sgitg*(H*D + 256) + 2*H*D);
const uint tiih = tiisg%tph; // thread index in head
const uint hiisg = tiisg/tph; // head index in simdgroup
@ -2115,23 +2115,24 @@ kernel void kernel_flash_attn_ext_f16(
half S = { 0.0h };
half M = { -INFINITY };
for (int64_t ic = sgitg; ic < ne11; ic += nsg) {
for (int64_t iic = 8*sgitg; iic < ne11; iic += 8*nsg) {
half mv[Q];
bool skip = true;
for (int64_t j = 0; j < Q; ++j) {
mv[j] = mp[j] ? mp[j][ic] : iq1 + j < ne01 ? 0.0h : -INFINITY;
mv[j] = mp[j][iic];
skip = skip && (mv[j] == -INFINITY);
}
if (skip) {
continue;
}
device const half4 * pk4 = (device const half4 *) ((device char *) k + (ic*nb11 + ik2*nb12 + ik3*nb13));
device const half4 * pv4 = (device const half4 *) ((device char *) v + (ic*nb21 + iv2*nb22 + iv3*nb23));
for (int p = 0; p < 8; ++p) {
const int64_t ic = iic + p;
{
half4 s4[Q] = { 0.0h };
device const half4 * pk4 = (device const half4 *) ((device char *) k + (ic*nb11 + ik2*nb12 + ik3*nb13));
half s[Q] = { 0.0h };
half4 pk4v[D4/tph];
for (int64_t i = 0; i < D4/tph; ++i) {
@ -2140,12 +2141,12 @@ kernel void kernel_flash_attn_ext_f16(
for (int64_t j = 0; j < Q; ++j) {
for (int64_t i = 0; i < D4/tph; ++i) {
s4[j] += pq4[j*T4 + hiisg*D4 + tph*i + tiih] * pk4v[i];
s[j] += dot(pq4[j*T4 + hiisg*D4 + tph*i + tiih], pk4v[i]);
}
}
for (int64_t j = 0; j < Q; ++j) {
ss[j*T + hiisg*tph + tiih] = (s4[j].x + s4[j].y + s4[j].z + s4[j].w);
ss[j*T + 32*p + hiisg*tph + tiih] = s[j];
}
}
@ -2154,39 +2155,45 @@ kernel void kernel_flash_attn_ext_f16(
if (tiih < Q) {
const int64_t j = tiih;
half4 s4 = 0.0h;
for (int p = 0; p < 8; ++p) {
half4 s4 = 0.0h;
for (int64_t i = 0; i < tph/4; ++i) {
s4 += ss4[j*T4 + hiisg*tph/4 + i];
for (int64_t i = 0; i < tph/4; ++i) {
s4 += ss4[j*T4 + 8*p + hiisg*tph/4 + i];
}
half s = (s4.x + s4.y + s4.z + s4.w)*scale + mp[j][iic + p];
const half m = M;
M = max(M, s);
const half ms = m == -INFINITY ? 0.0h : exp(m - M);
const half vs = s == -INFINITY ? 0.0h : exp(s - M);
S = S*ms + vs;
ss[j*T + 32*p + 2*hiisg + 0] = ms;
ss[j*T + 32*p + 2*hiisg + 1] = vs;
}
half s = (s4.x + s4.y + s4.z + s4.w)*scale + mv[j];
const half m = M;
M = max(M, s);
const half ms = m == -INFINITY ? 0.0h : exp(m - M);
const half vs = s == -INFINITY ? 0.0h : exp(s - M);
S = S*ms + vs;
ss[j*T + 2*hiisg + 0] = ms;
ss[j*T + 2*hiisg + 1] = vs;
}
simdgroup_barrier(mem_flags::mem_none);
{
for (int p = 0; p < 8; ++p) {
const int64_t ic = iic + p;
device const half4 * pv4 = (device const half4 *) ((device char *) v + (ic*nb21 + iv2*nb22 + iv3*nb23));
half ms[Q] = { 1.0h };
half vs[Q] = { 0.0h };
for (int64_t j = 0; j < Q; ++j) {
ms[j] = ss[j*T + 2*hiisg + 0];
vs[j] = ss[j*T + 2*hiisg + 1];
ms[j] = ss[j*T + 32*p + 2*hiisg + 0];
vs[j] = ss[j*T + 32*p + 2*hiisg + 1];
}
half4 pv4v[D4/tph];
thread half4 pv4v[D4/tph];
for (int64_t i = 0; i < D4/tph; ++i) {
pv4v[i] = pv4[tph*i + tiih];
}
@ -2213,11 +2220,11 @@ kernel void kernel_flash_attn_ext_f16(
for (int64_t j = 0; j < Q; ++j) {
for (int64_t sg = 1; sg < nsg; ++sg) {
const half S0 = ss[j*T + 2*hiisg + 0];
const half S1 = ss[j*T + sg*(H*D + 32) + 2*hiisg + 0];
const half S0 = ss[j*T + 2*hiisg + 0];
const half S1 = ss[j*T + sg*(H*D + 256) + 2*hiisg + 0];
const half M0 = ss[j*T + 2*hiisg + 1];
const half M1 = ss[j*T + sg*(H*D + 32) + 2*hiisg + 1];
const half M0 = ss[j*T + 2*hiisg + 1];
const half M1 = ss[j*T + sg*(H*D + 256) + 2*hiisg + 1];
M = max(M0, M1);
@ -2232,7 +2239,7 @@ kernel void kernel_flash_attn_ext_f16(
}
for (int64_t i = 0; i < D4/tph; ++i) {
ps4[j*T4 + hiisg*D4 + tph*i + tiih] = ps4[j*T4 + hiisg*D4 + tph*i + tiih]*ms0 + ps4[j*T4 + sg*(H*D + 32)/4 + hiisg*D4 + tph*i + tiih]*ms1;
ps4[j*T4 + hiisg*D4 + tph*i + tiih] = ps4[j*T4 + hiisg*D4 + tph*i + tiih]*ms0 + ps4[j*T4 + sg*(H*D + 256)/4 + hiisg*D4 + tph*i + tiih]*ms1;
}
}
@ -2244,17 +2251,12 @@ kernel void kernel_flash_attn_ext_f16(
simdgroup_barrier(mem_flags::mem_threadgroup);
// dst indices
const int64_t i1 = iq1;
const int64_t i2 = iq2;
const int64_t i3 = iq3;
device float4 * dst4 = (device float4 *) dst;
if (sgitg == 0) {
for (int64_t j = 0; j < Q && iq1 + j < ne01; ++j) {
for (int64_t i = 0; i < D4/tph; ++i) {
dst4[(i3*ne2*ne1 + i2 + (i1 + j)*ne1)*D4 + tph*i + tiih] = (float4) ps4[j*T4 + hiisg*D4 + tph*i + tiih];
dst4[(iq3*ne2*ne1 + iq2 + (iq1 + j)*ne1)*D4 + tph*i + tiih] = (float4) ps4[j*T4 + hiisg*D4 + tph*i + tiih];
}
}
}

8
tests/test-backend-ops.cpp
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@ -1397,7 +1397,7 @@ struct test_flash_attn_ext : public test_case {
}
double max_nmse_err() override {
return 5e-6;
return 5e-5;
}
test_flash_attn_ext(ggml_type typeq = GGML_TYPE_F16,
@ -1680,9 +1680,9 @@ static bool test_backend(ggml_backend_t backend, test_mode mode, const char * op
test_cases.emplace_back(new test_pad());
test_cases.emplace_back(new test_leaky_relu());
test_cases.emplace_back(new test_flash_attn_ext(GGML_TYPE_F16, 128, 32, 96, 8));
test_cases.emplace_back(new test_flash_attn_ext(GGML_TYPE_F16, 128, 32, 32, 7));
test_cases.emplace_back(new test_flash_attn_ext(GGML_TYPE_F16, 128, 32, 96, 1));
test_cases.emplace_back(new test_flash_attn_ext(GGML_TYPE_F16, 128, 32, 256, 8));
test_cases.emplace_back(new test_flash_attn_ext(GGML_TYPE_F16, 128, 32, 256, 7));
test_cases.emplace_back(new test_flash_attn_ext(GGML_TYPE_F16, 128, 32, 256, 1));
#if !defined(__SANITIZE_THREAD__)
// FIXME: these tests use too much memory with thread sanitizer