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From: Lynne <dev@lynne.ee>
To: ffmpeg-devel@ffmpeg.org
Date: Thu, 13 Mar 2025 18:03:41 +0100
Message-ID: <20250313170355.92290-10-dev@lynne.ee>
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Subject: [FFmpeg-devel] [PATCH v4 09/16] vulkan_decode: adjust number of
async contexts created
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This caps the number of contexts we create based on thread count.
This saves VRAM and filters out cases where more async is of lesser
benefit.
---
libavcodec/vulkan_decode.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/libavcodec/vulkan_decode.c b/libavcodec/vulkan_decode.c
index 7f638d6fc6..cd77e10e12 100644
--- a/libavcodec/vulkan_decode.c
+++ b/libavcodec/vulkan_decode.c
@@ -1122,6 +1122,7 @@ int ff_vk_decode_init(AVCodecContext *avctx)
FFVulkanDecodeShared *ctx;
FFVulkanContext *s;
FFVulkanFunctions *vk;
+ int async_depth;
const VkVideoProfileInfoKHR *profile;
const FFVulkanDecodeDescriptor *vk_desc;
const VkPhysicalDeviceDriverProperties *driver_props;
@@ -1191,9 +1192,14 @@ int ff_vk_decode_init(AVCodecContext *avctx)
/* Create decode exec context for this specific main thread.
* 2 async contexts per thread was experimentally determined to be optimal
* for a majority of streams. */
+ async_depth = 2*ctx->qf->num;
+ /* We don't need more than 2 per thread context */
+ async_depth = FFMIN(async_depth, 2*avctx->thread_count);
+ /* Make sure there are enough async contexts for each thread */
+ async_depth = FFMAX(async_depth, avctx->thread_count);
+
err = ff_vk_exec_pool_init(s, ctx->qf, &ctx->exec_pool,
- FFMAX(2*ctx->qf->num, avctx->thread_count),
- 0, 0, 0, profile);
+ async_depth, 0, 0, 0, profile);
if (err < 0)
goto fail;
--
2.47.2
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