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Although most users are saying good things about OS X El Capitan, it is not devoid of problems.

Like its predecessors, it does have a number of problems including it somehow causing your Mac to be rather slow. This is a common occurrence, especially in older Macs… though newer ones have also been affected. The El Capitan is designed to make your computer run faster – after all, it managed to free up space. In some users though, it has done the opposite: making machines run slower than they did on Yosemite.

Despite the new features and improvements, some users went as far as dubbing it “El Crapitan”, highlighting the need for fixes to make their slow Mac computers run more smoothly. Apart from which, there are also quite a few problems hounding it: some have been fixed, while others are still around.

Regardless, it’s important to possess a clear mindset and remember that every problem has a solution. We’ve compiled a list of problems, including the speed-related ones, along with their respective fixes.

Speed and performance issues

A slow Mac computer running OS X El Capitan is more common than you think: numerous Mac users have been complaining about it in the Apple Support Forums. Although there are some who claim that their computers’ performance dramatically improved, certain users say the opposite and complain of the following problems:

  • Frozen apps. People with this problem had to use the Force Quit option to gain some semblance of control from their computers again.
  • Spending time with the spinning beach ball. This is always an unwelcome sight in Mac computers: the spinning beach ball signifies that a Mac is loading slowly or is freezing.
  • Slow boot up. Sure, Macs their time when booting up, but the problem has become noticeable to some Mac users. One even complained that the Dock takes its sweet time to load.
  • Saving files takes longer. This happens regardless of the program you use, whether it’s a word processing one, or a photo editing software.
  • Typing and cursor lag. Though this sounds rather unheard of in today’s computers, several users have complained of delays whenever they type something or whenever they move their cursors. This wouldn’t be surprising if there are programs running in the background.

Fixing a slow Mac

There are several methods you can employ to get rid of the speed issues hounding your Mac. If you don’t want it to run like a “one-legged donkey”, taken from the words of another user in the forums, here are your options:

Clean up your hard drive

The issue may not even be an operating system related one in the first place: it could be that your hard drive is on the brink of being full. If you lighten the strain on your hard drive, your computer is sure to speed up a notch and solve most performance issues.

However, searching for individual files, particularly videos and uninstalled applications, isn’t that simple on a Mac. Consider installing third-party software like CleanMyMac (read our review), an app which can help you get rid of cluttered files that take up a ton of space from a single, central program.

Repair disk permissions with Disk Utility

One of the main reasons why some users are experiencing performance issues in El Capitan is mainly because of the wrongly configured disk permissions. Basically, these are file settings which affects the computer’s ability to read, run, and execute a file. If the permissions are wrongly configured, then the software that uses the file may not be able to run it correctly, causing speed issues.

However, in El Capitan, disk permissions are protected and you can no longer access it. However, you can still repair it using CleanMyMac by going to the maintenance tab and proceeding to the “Repair Disk Permissions”.

Apps running in the background

If you’re complaining that your Mac is running slow when you have a iMovie, Photoshop, and a game running in the background, then you should probably quit all the programs in the background first before airing your grievances online.

You can check out the programs causing the performance issues on the Activity Monitor. To access this simply go to Spotlight or go to the Utilities folder via Applications.

Reinstall El Capitan

If the above mentioned fixes don’t work, then you might have to reinstall El Capitan. You never know, something might have gone wrong during the installation phase. Note that you should only do this as a last resort (unless if you’re willing to downgrade to Yosemite) before you head over to the Apple Store.

To reinstall the operating system, here’s a guide.

Revert back to Yosemite

If you think you’ve done everything you can to salvage your computer and at the same time, keep El Capitan, but to no avail, you can revert back to Yosemite if you want. Do so, especially if you haven’t had any issues with it in the past. However, the whole process will require a lot of effort and a few hours. Here’s a guide by Gotta Be Mobile.

Also note that if your hardware is old and your RAM is four gigabytes max, then you’re bound to have performance issues. In this case, your best bet would be to purchase a new Mac computer.

Apart from the speed and performance issues, there are other, more specific problems as well. Fixing them is a must because after all, they touch on the Mac’s basic and most-used functions.

Slow WiFi problem

Although the slow WiFi problems hounding Yosemite have barely been carried over into El Capitan, you may still encounter some problems. Fortunately, there are a few things you can do to fix this, including:

  • By simply restarting and unplugging your router and the modem. Keep them off for at least 30 seconds to several minutes. This usually does the trick in most cases.
  • Turn your WiFi off on your Mac and turning it back on again after a minute or two.
  • Go to Network Preferences > Advanced then delete the WiFi network the re-add it.
  • Turn off Bluetooth. This can be a problem if you’re using Apple’s newest Bluetooth accessories for Mac, however.

Microsoft Office problems

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When Mac users installed El Capitan, the most telling problem was the unresponsiveness of Microsoft Office, which is highlighted by lag and slow loading speeds.

Fortunately, Apple has recently released an El Capitan patch that fixes the problem. You can install the newest patch by heading over to the Apple icon on the left side of the menu bar and by performing a system update. Microsoft also released a patch of its own.

Printer problems

Apparently, El Capitan has trouble printing landscape documents – this arises when users try to print PDF landscape documents using the Preview feature.

Though the best way to solve this problem is to not print PDF documents directly from Preview, there’s one way to fix it by resetting the printing system. Do this by heading over to System Preferences then to Printers & Scanners. Click on the Print tab and right click on the printer and select Reset Printing System. After doing so, restart both your Mac and printer. After doing so, you will be able to print documents without worry.

Battery Life

If you’ve noticed that your Mac’s battery life is shorter than usual after the upgrade, then it’s mainly because of Spotlight. It could be indexing files, which is why it’s using more power than usual. Try to let the whole process finish so Spotlight will be able to run smoothly.

However, if the battery life issue still hasn’t been fixed, you can resort to the following solutions:

  • Using Safari instead of third-party browsers. Sure, Chrome and Firefox may be better compared to Safari, but if considering that Apple’s own browser manages memory better than others, it saves power. The difference may not be initially noticeable, but it works.
  • Reducing screen brightness. Not only does a bright screen hurt the eyes, but it also drains your battery rather quickly. Reduce screen brightness by going to System Preferences then to Displays. Dim down the brightness and be sure to uncheck the Automatically adjust brightness option.

Slow Safari

Another post El Capitan problem is the slower Safari. If you’re experiencing lag and slow loading speeds, simply fix the problem by clearing the cache. Do this by heading over to Safari in the menu bar, clicking Preferences, then Privacy, and finally clicking on the Remove all website data option.

Basically, the cache is designed to quicken loading times by saving certain elements in web pages that you visit often. For example, if you happen to visit a particular blog everyday, the browser takes note of this and downloads certain elements present in it. However, doing too much of this can slow down the browser experience, especially when some of the already-downloaded elements are now outdated.

Overall, a slow Mac can always be fixed . Though it has had its host of problems, this does not change the fact that it’s arguably one of Apple’s best operating systems in recent memory.

Updated 7 April 2020

Peter Lobner

The best current supercomputers are “petascale” machines. This term refers to supercomputers capable of performing at least 1.0 petaflops [PFLOPS; 1015 floating-point operations per second (FLOPS)], and also refers to data storage systems capable of storing at least 1.0 petabyte (PB; 1015 bytes) of data.

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In my 13 November 2018 post, I reported the latest TOP500 ranking of the world’s fastest supercomputers. The new leaders were two US supercomputers: Summit and Sierra. A year later, in November 2019, they remained at the top of the TOP500 ranking.

  • Summit: The #1 ranked IBM Summit is installed at the Department of Energy’s (DOE) Oak Ridge National Laboratory (ORNL) in Tennessee. It has a LINPACK Benchmark Rmax (maximal achieved performance) rating of 148.6 PFLOPS (1.486 x 1017 FLOPS) and an Rpeak (theoretical peak performance) rating of 200.8 PFLOPS. Summit’s peak electric power demand is 10.01 MW (megawatts).
  • Sierra:The #2 ranked IBM Sierra is installed at the DOE’s Lawrence Livermore National Laboratory (LLNL) in California. It has an Rmax rating of 94.64 PFLOPS (0.9464 x 1017 FLOPS) and an Rpeak rating of 125.7 PFLOPS. Sierra’s peak electric power demand is 7.44 MW.

The next update of the TOP500 ranking will be in June 2020. Check out their website here to see if the rankings change: http:// https://www.top500.org

New exascale machines are only a year or two away

The next big step up in supercomputing power will be the arrival of “exascale” machines, which refers to supercomputers capable of performing at least 1.0 exaflops (EFLOPS; 1018 FLOPS), and also refers to data storage systems capable of storing at least 1.0 exabyte (EB, 1018 bytes) of data. As you might suspect, there is intense international completion to be the first nation to operate an exascale supercomputer. The main players are the US, China and Japan.

In the US, DOE awarded contracts to build three new exascale supercomputers:

  • Aurora, announced in March 2019
  • Frontier, announced in May 2019
  • El Capitan, announced in March 2020

In this post, we’ll take a look at these three new supercomputers, each of which will be about ten times faster than the existing TOP500 leaders, Summit and Sierra.

Aurora supercomputer for ANL

The Aurora supercomputer is being built at Argonne National Laboratory (ANL) by the team of Intel (prime contractor) and Cray (subcontractor), under a contract valued at more than $500 million.

The computer architecture is based on the Cray “Shasta” system and Intel’s Xeon Scalable processor, Xe compute architecture, Optane Datacenter Persistent Memory, and One API software. Those Cray and Intel technologies will be integrated into more than 200 Shasta cabinets, all connected by Cray’s Slingshot interconnect and associated software stack.

Aurora is expected to come online by the end of 2021 and likely will be the first exascale supercomputer in the US. It is being designed for sustained performance of one exaflops. An Argonne spokesman stated, “This platform is designed to tackle the largest AI (artificial intelligence) training and inference problems that we know about.”

For more information on the Aurora supercomputer, see the 18 March 2019 ANL press release here: https://www.anl.gov/article/us-department-of-energy-and-intel-to-deliver-first-exascale-supercomputer

Frontier supercomputer for ORNL

The Frontier supercomputer is being built by at ORNL by the team of Cray (prime contractor) and Advanced Micro Devices, Inc. (AMD, subcontractor), under a contract valued at about $600 million.

The computer architecture is based on the Cray “Shasta” system and will consist of more than 100 Cray Shasta cabinets with high density “compute blades” that support a 4:1 GPU to CPU ratio using AMD EPYC processors (CPUs) and Radeon Instinct GPU accelerators purpose-built for the needs of exascale computing. Cray and AMD are co-designing and developing enhanced GPU programming tools.

Frontier is expected to come online in 2022 after Aurora, but is expected to be more powerful, with a rating of 1.5 exaflops. Frontier will find applications in deep learning, machine learning and data analytics for applications ranging from manufacturing to human health.

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For more information on the Frontier supercomputer, see the 7 May 2019 ORNL press release here: https://www.ornl.gov/news/us-department-energy-and-cray-deliver-record-setting-frontier-supercomputer-ornl

El Capitan supercomputer for NNSA Labs

The El Capitan supercomputer, announced in March 2020, will be built at LLNL by the team of Hewlett Packard Enterprise (HPE) and AMD under a $600 million contract. El Capitan is funded by the DOE’s National Nuclear Security Administration (NNSA) under their Advanced Simulation and Computing (ASC) program. The primary users will be the three NNSA laboratories: LLNL, Sandia National Laboratories and Los Alamos National Laboratory. El Capitan will be used to perform complex predictive modeling and simulation to support NNSA’s nuclear weapons life extension programs (LEPs), which address aging weapons management, stockpile modernization and other matters.

El Capitan’s peak performance is expected to exceed 2 exaflops, making it about twice as fast as Aurora and about 30% faster than Frontier.

LLNL describes the El Capitan hardware as follows: “El Capitan will be powered by next-generation AMD EPYC processors, code-named ‘Genoa’ and featuring the ‘Zen 4’ processor core, next-generation AMD Radeon Instinct GPUs based on a new compute-optimized architecture for workloads including HPC and AI, and the AMD Radeon Open Compute platform (ROCm) heterogeneous computing software.”

NNSA’s El Capitan is expected to come online in 2023 at LLNL, about a year after ANL’s Aurora and ORNL’s Frontier.For more information on the El Capitan supercomputer, see the 5 March 2020 LLNL press release here: https://www.llnl.gov/news/llnl-and-hpe-partner-amd-el-capitan-projected-worlds-fastest-supercomputer

Hewlett Packard Enterprise acquires Cray in May 2019

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On 17 May 2019, Hewlett Packard Enterprise (HPE) announced that it has acquired Cray, Inc. for about $1.3 billion. The following charts from the November 2018 TOP500 report gives some interesting insight into HPE’s rationale for acquiring Cray. In the Vendor’s System Share chart, both HPE and Cray have a 9 – 9.6% share of the market based on the number of installed TOP500 systems. In the Vendor’s Performance Share chart, the aggregate installed performance of Cray systems far exceeds the aggregate performance of a similar number of lower-end HPE systems (25.5% vs. 7.3%). The Cray product line fits above the existing HPE product line, and the acquisition of Cray should enable HPE to compete directly with IBM in the supercomputer market. HPE reported that it sees a growing market for exascale computing. The primary US customers are government laboratories.

The March 2020 award of NNSA’s El Capitan supercomputer to the HPE and AMD team seems to indicate that HPE made a good decision in their 2019 acquisition of Cray.

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Meanwhile in China:

On 19 May 2019, the South China Morning Post reported that China is making a multi-billion dollar investment to re-take the lead in supercomputer power. In the near-term (possibly in 2019), the newest Shuguang supercomputers are expected to operate about 50% faster than the US Summit supercomputer. This should put the new Chinese super computers in the Rmax = 210 – 250 PFLOPS range.

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In addition, China is expected to have its own exascale supercomputer operating in 2020, a year ahead of the first US exascale machine, with most, if not all, of the hardware and software being developed in China. This computer will be installed at the Center of the Chinese Academy of Sciences (CAS) in Beijing.

You’ll find a description of China’s three exascale prototypes installed in 2018 and a synopsis of what is known about the first exascale machine on the TOP500 website at the following link: https://www.top500.org/news/china-spills-details-on-exascale-prototypes/

Where to next?

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Why, zettascale, of course. These will be supercomputers performing at least 1.0 zettaflops (ZFLOPS; 1021 FLOPS), while consuming about 100 megawatts (MW) of electrical power.

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Check out the December 2018 article by Tiffany Trader, “Zettascale by 2035? China thinks so,” at the following link: https://www.hpcwire.com/2018/12/06/zettascale-by-2035/