brew install iperf3
Running `brew update --auto-update`...安装homebrew，长久没用使用更新失效了。只好重新安装
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"```破案了
原来是需要海外网了。。。。
brew install iperf3
liangyuyue@YuyueMacBook-Air ~ % brew install iperf3
==> Downloading https://formulae.brew.sh/api/formula.jws.json
==> Downloading https://ghcr.io/v2/homebrew/core/iperf3/manifests/3.19
######################################################################### 100.0%
==> Fetching dependencies for iperf3: ca-certificates and openssl@3
==> Downloading https://ghcr.io/v2/homebrew/core/ca-certificates/manifests/2025-
######################################################################### 100.0%
==> Fetching ca-certificates
==> Downloading https://ghcr.io/v2/homebrew/core/ca-certificates/blobs/sha256:dd
######################################################################### 100.0%
==> Downloading https://ghcr.io/v2/homebrew/core/openssl/3/manifests/3.5.1
######################################################################### 100.0%
==> Fetching openssl@3
==> Downloading https://ghcr.io/v2/homebrew/core/openssl/3/blobs/sha256:fadc8218
######################################################################### 100.0%
==> Fetching iperf3
==> Downloading https://ghcr.io/v2/homebrew/core/iperf3/blobs/sha256:e2ca4956b12
######################################################################### 100.0%
==> Installing dependencies for iperf3: ca-certificates and openssl@3
==> Installing iperf3 dependency: ca-certificates
==> Downloading https://ghcr.io/v2/homebrew/core/ca-certificates/manifests/2025-
Already downloaded: /Users/liangyuyue/Library/Caches/Homebrew/downloads/bc18acc15e0abddc102f828b57a29cfdbec1b6b002db37ad12bad9dbf0e9d12f--ca-certificates-2025-05-20.bottle_manifest.json
==> Pouring ca-certificates--2025-05-20.all.bottle.tar.gz
==> Regenerating CA certificate bundle from keychain, this may take a while...
🍺 /opt/homebrew/Cellar/ca-certificates/2025-05-20: 4 files, 225.8KB
==> Installing iperf3 dependency: openssl@3
==> Downloading https://ghcr.io/v2/homebrew/core/openssl/3/manifests/3.5.1
Already downloaded: /Users/liangyuyue/Library/Caches/Homebrew/downloads/9d8c8da104539ae29f198f366fe5794ac377d96a92458ae62557e3f83b03a351--openssl@3-3.5.1.bottle_manifest.json
==> Pouring openssl@3--3.5.1.arm64_ventura.bottle.tar.gz
🍺 /opt/homebrew/Cellar/openssl@3/3.5.1: 7,563 files, 35.4MB
==> Installing iperf3
==> Pouring iperf3--3.19.arm64_ventura.bottle.tar.gz
🍺 /opt/homebrew/Cellar/iperf3/3.19: 12 files, 555.5KB
==> Running `brew cleanup iperf3`...
Disable this behaviour by setting HOMEBREW_NO_INSTALL_CLEANUP.
iperf3 -c 192.168.1.99 -p 5001 -t 10 -i 1-c 192.168.1.10：服务器 IP
-p 5001：服务器端口
-t 10：持续 10 秒。
-i 1：每一秒✋一次