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Georgi Gerganov 2024-01-24 11:18:24 +02:00
parent 5cbdba693d
commit af3eda9c77
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2 changed files with 81 additions and 29 deletions
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9
ggml-metal.m
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@ -2253,11 +2253,12 @@ 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 nsg = 4; // simdgroups per threadgroup (a.k.a. warps)
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 int64_t nsg = 2; // simdgroups per threadgroup (a.k.a. warps)
const int64_t nhptg = 4; // heads per threadgroup !! sync with kernel template arguments !!
const int64_t nqptg = 2; // queries per threadgroup !! sync with kernel template arguments !!
const size_t smem = nqptg*(nhptg*ne00 + nsg*(nhptg*ne00 + 256))*(sizeof(float)/2);
//const size_t smem = nqptg*(nhptg*ne00 + nsg*(nhptg*ne00 + 256))*(sizeof(float)/2);
const size_t smem = nqptg*(nhptg*ne00 + nsg*(256))*(sizeof(float)/2);
GGML_ASSERT(smem <= ctx->device.maxThreadgroupMemoryLength);
[encoder setThreadgroupMemoryLength:smem atIndex:0];

101
ggml-metal.metal
View File

@ -2078,17 +2078,18 @@ kernel void kernel_flash_attn_ext_f16(
const int64_t D4 = D/4;
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
const int64_t T = (H*D + nsg*(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 + 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);
threadgroup half4 * pq4 = (threadgroup half4 *) (shared + 0*H*D);
threadgroup half * ss = (threadgroup half *) (shared + sgitg*(256) + 1*H*D);
threadgroup half4 * ss4 = (threadgroup half4 *) (shared + sgitg*(256) + 1*H*D);
const uint tiih = tiisg%tph; // thread index in head
const uint hiisg = tiisg/tph; // head index in simdgroup
half4 ps4[Q][D4/tph];
// load H heads from Q to shared memory
for (int64_t i = 0; i < D4/tph; ++i) {
for (int64_t j = sgitg; j < Q; j += nsg) {
@ -2100,7 +2101,8 @@ kernel void kernel_flash_attn_ext_f16(
}
for (int64_t j = 0; j < Q; ++j) {
ps4[j*T4 + hiisg*D4 + tph*i + tiih] = 0.0h;
//ps4[j*T4 + hiisg*D4 + tph*i + tiih] = 0.0h;
ps4[j][i] = 0.0h;
}
}
@ -2191,16 +2193,12 @@ kernel void kernel_flash_attn_ext_f16(
}
for (int64_t j = 0; j < Q; ++j) {
half4 ps4v = ps4[j*T4 + hiisg*D4 + tph*i + tiih];
for (int p = 0; p < 8; ++p) {
const half ms = ss[j*T + 32*p + 2*hiisg + 0];
const half vs = ss[j*T + 32*p + 2*hiisg + 1];
ps4v = ps4v*ms + pv4v[p]*vs;
ps4[j][i] = ps4[j][i]*ms + pv4v[p]*vs;
}
ps4[j*T4 + hiisg*D4 + tph*i + tiih] = ps4v;
}
}
}
@ -2215,15 +2213,58 @@ kernel void kernel_flash_attn_ext_f16(
threadgroup_barrier(mem_flags::mem_threadgroup);
// reduce the warps
if (sgitg == 0) {
for (int64_t j = 0; j < Q; ++j) {
for (int64_t sg = 1; sg < nsg; ++sg) {
//if (sgitg == 0) {
// 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 + 256) + 2*hiisg + 0];
// const half S0 = ss[j*T + 2*hiisg + 0];
// const half S1 = ss[j*T + sg*(256) + 2*hiisg + 0];
const half M0 = ss[j*T + 2*hiisg + 1];
const half M1 = ss[j*T + sg*(H*D + 256) + 2*hiisg + 1];
// const half M0 = ss[j*T + 2*hiisg + 1];
// const half M1 = ss[j*T + sg*(256) + 2*hiisg + 1];
// M = max(M0, M1);
// const half ms0 = exp(M0 - M);
// const half ms1 = exp(M1 - M);
// S = S0*ms0 + S1*ms1;
// if (tiih == 0) {
// ss[j*T + 2*hiisg + 0] = S;
// ss[j*T + 2*hiisg + 1] = M;
// }
// 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*(256)/4 + hiisg*D4 + tph*i + tiih]*ms1;
// }
// }
// 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]/S;
// }
// }
//}
for (int64_t sg = 1; sg < nsg; ++sg) {
if (sgitg == sg) {
// store heads to shared memory - reuse pq4
for (int64_t j = 0; j < Q; ++j) {
for (int64_t i = 0; i < D4/tph; ++i) {
pq4[j*T4 + hiisg*D4 + tph*i + tiih] = ps4[j][i];
}
}
}
threadgroup_barrier(mem_flags::mem_threadgroup);
if (sgitg == 0) {
for (int64_t j = 0; j < Q; ++j) {
const half S0 = ss[j*T + 2*hiisg + 0];
const half S1 = ss[j*T + sg*(256) + 2*hiisg + 0];
const half M0 = ss[j*T + 2*hiisg + 1];
const half M1 = ss[j*T + sg*(256) + 2*hiisg + 1];
M = max(M0, M1);
@ -2238,12 +2279,21 @@ 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 + 256)/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*(256)/4 + hiisg*D4 + tph*i + tiih]*ms1;
ps4[j][i] = ps4[j][i]*ms0 + pq4[j*T4 + hiisg*D4 + tph*i + tiih]*ms1;
}
}
}
threadgroup_barrier(mem_flags::mem_threadgroup);
}
if (sgitg == 0) {
for (int64_t j = 0; j < Q; ++j) {
S = ss[j*T + 2*hiisg + 0];
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]/S;
//ps4[j*T4 + hiisg*D4 + tph*i + tiih] = ps4[j*T4 + hiisg*D4 + tph*i + tiih]/S;
ps4[j][i] = ps4[j][i]/S;
}
}
}
@ -2255,15 +2305,16 @@ kernel void kernel_flash_attn_ext_f16(
if (sgitg == 0) {
for (int64_t j = 0; j < Q && iq1 + j < ne01; ++j) {
for (int64_t i = 0; i < D4/tph; ++i) {
dst4[(iq3*ne2*ne1 + iq2 + (iq1 + 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];
dst4[(iq3*ne2*ne1 + iq2 + (iq1 + j)*ne1)*D4 + tph*i + tiih] = (float4) ps4[j][i];
}
}
}
}
template [[host_name("kernel_flash_attn_ext_f16_h64" )]] kernel flash_attn_ext_f16_t kernel_flash_attn_ext_f16<64, 2, 4>;
template [[host_name("kernel_flash_attn_ext_f16_h80" )]] kernel flash_attn_ext_f16_t kernel_flash_attn_ext_f16<80, 2, 4>;
template [[host_name("kernel_flash_attn_ext_f16_h128")]] kernel flash_attn_ext_f16_t kernel_flash_attn_ext_f16<128, 2, 4>;
template [[host_name("kernel_flash_attn_ext_f16_h64" )]] kernel flash_attn_ext_f16_t kernel_flash_attn_ext_f16<64, 4, 2>;
template [[host_name("kernel_flash_attn_ext_f16_h80" )]] kernel flash_attn_ext_f16_t kernel_flash_attn_ext_f16<80, 4, 2>;
template [[host_name("kernel_flash_attn_ext_f16_h128")]] kernel flash_attn_ext_f16_t kernel_flash_attn_ext_f16<128, 4, 2>;
kernel void kernel_cpy_f16_f16(
device const half * src0,